Squarebody Parts Buyer’s Guide: 1973-1987 Chevy & GMC Truck Parts

Few trucks earn loyalty the way the 1973-1987 Chevrolet and GMC pickups do, and finding the right squarebody parts is the difference between a weekend fix and a stalled project. Whether you drive a daily C10 or you are chasing a frame-off restoration, this guide walks you through what these trucks are, how to pin down your exact year, and which parts to buy for every corner of the build. The goal is simple: help you order the correct piece the first time.

Quick answer: Buy squarebody parts from a specialist that stocks OEM-quality reproduction and restoration pieces organized by the 1973-1987 body style, like the catalog at oemsquarebodyparts.com. Before you order anything, identify whether your truck is a 1973-1980 or a facelifted 1981-1987 model, because grilles, dashes, and trim changed between the two eras. Match the part to your exact year, cab, and bed style, and you will avoid almost every fitment headache.

What counts as a squarebody, and why parts are easy to find

“Squarebody” is the nickname enthusiasts gave GM’s third-generation C/K trucks, named for their flat, boxy sheet metal. The pickups ran from 1973 through 1987, spanning the half-ton C10 and K10, three-quarter-ton C20 and K20, and one-ton C30 and K30. The C-series trucks are two-wheel drive while the K-series trucks are four-wheel drive. The same body style continued on the Blazer, Jimmy, and Suburban all the way through 1991, which is why so many square body chevy parts cover that longer window.

These trucks were built in enormous numbers for nearly 15 years, so the aftermarket for 73-87 chevy truck parts is deep and healthy. GM eventually replaced the squarebody with the rounded GMT400 generation, known today as the “OBS” trucks, starting in 1988. If you want a closer look at how the two generations differ, see our breakdown of squarebody vs OBS truck differences. The practical takeaway is that high demand plus a huge production run keeps reproduction parts plentiful and affordable.

That popularity is a real advantage when you are sourcing square body chevy parts. Unlike some vintage trucks where a single cracked piece can stall a project for months, the squarebody community benefits from manufacturers who keep common items in steady production. Floor pans, cab corners, grilles, seals, and trim are reproduced year after year because the demand never fades. For you, that means shorter waits, competitive pricing, and the ability to tackle a restoration in stages instead of hunting junkyards for every nut and bolt. It also means you can hold reproductions to a high standard, since there is usually more than one option for popular pieces.

How to identify your truck and year before buying squarebody parts

The single most important step before buying any squarebody parts is knowing exactly what you have. The 1973-1987 run splits into two visually distinct eras, and ordering for the wrong era is the most common mistake we see.

1973-1980: the early squarebody

Early trucks wear a lower, wider grille and simpler front-end styling. Dashboards, gauge clusters, and interior trim from this era are specific to these years and generally do not interchange with the later facelift. If your truck has the original egg-crate or horizontal-bar grille sitting low in the front valance, you are almost certainly looking at a 1973-1980 model.

1981-1987: the facelifted squarebody

The 1981 refresh brought a squarer, taller grille, available quad and stacked headlight arrangements, and a redesigned dash. These later trucks also saw small trim and emblem changes year to year. Because the facelift touched the grille, headlights, and interior, you must confirm your era before buying any of those pieces. When in doubt, check the VIN plate and the build information, or compare your front end against our detailed squarebody model years guide. Confirming the exact year, cab configuration, and bed style up front is the heart of buying squarebody restoration parts correctly.

Body Panels

Body panels are where most restorations begin, because rust and dents are the squarebody’s natural enemies. Floor pans, cab corners, rockers, fenders, bed sides, tailgates, and wheelhouses are all reproduced in OEM-quality steel. When you shop, match the panel to your bed style first. A Fleetside bed uses completely different outer panels than a Stepside. Pieces like the 1976-80 Fleetside tailgate panel and the 1973-87 Fleetside inner wheelhouse panel are popular starting points. Browse the full selection on the body panels category page and always confirm the left or right side before checkout.

When you plan a sheet metal repair, think in terms of how the panels stack together. Cab corners and rockers go hand in hand, and it is common to replace both at once since rust rarely stops at a single seam. If your bed sides are pitted, inspect the inner wheelhouses and bed floor before you order, because water trapped behind the outer skin usually does damage you cannot see from the driver’s seat. Buying the matched inner and outer panels together saves a second shipment and keeps your gaps consistent. Most of these squarebody restoration parts are stamped in the correct gauge steel, so they weld in cleanly if you take the time to test fit before laying down a bead.

Exterior

Exterior parts cover everything that gives your truck its face and finish: grilles, headlight bezels, mirrors, emblems, bumpers, and moldings. This is the category where the 1973-1980 versus 1981-1987 split matters most, since the grille and headlight setup changed with the facelift. If you run a later single-headlight truck, a matched kit like the 1985-87 grille kit with single headlights takes the guesswork out of ordering. Small details matter too, and an upgrade such as the 1973-87 LED outside rearview mirror adds modern visibility while keeping the correct look. See more options under exterior.

Interior

A worn interior drags down an otherwise clean truck, and the cabin is one of the most satisfying areas to restore. Seat upholstery, carpet, dash pads, door panels, window cranks, and trim are all available to bring a tired cab back to life. Because the dash was redesigned for the 1981-1987 era, interior pieces are often year-specific, so verify your range before ordering. A clean touch like the 1981-87 aluminum door panel inserts restores that factory look without a full panel swap. Explore the complete lineup under interior. When you plan an interior refresh, start with the pieces you touch every day, like the steering wheel, shifter, and door panels, then work outward to carpet and headliner. Small wins in the cab keep a long project motivating.

Mechanical

Keeping a squarebody on the road means staying ahead of the mechanical wear items. This category spans suspension components, brakes, steering, cooling, fuel delivery, and engine accessories, all sized for the C10 through C30 and K10 through K30 chassis. When buying mechanical C10 parts, pay attention to your truck’s GVW rating and drivetrain, because half-ton, three-quarter-ton, and one-ton trucks often use different components even in the same year. Two-wheel-drive and four-wheel-drive setups also differ. Shop the mechanical category and filter to your model so you get the correct spec the first time.

A smart approach to mechanical work is to group related jobs. If you are already under the truck replacing shocks, it is a good moment to refresh bushings, brake lines, and steering components that share the same access. Cooling system parts are another area worth staying ahead of, since an original radiator or water pump that has survived decades is living on borrowed time. Keep your original part numbers and casting marks handy when you order, because they help confirm you are matching the right generation of C10 parts rather than a close but incorrect substitute. A little record keeping now prevents a return trip to the parts bin later.

Weatherstripping

Fresh weatherstripping is one of the cheapest upgrades with the biggest payoff. New door seals, window channels, cab mounts, and glass seals quiet the cabin, stop leaks, and protect your new interior from water damage. Many seals span the full body-style run, including Blazer, Jimmy, and Suburban applications through 1991, so a part like the 1974-91 Blazer side window seal covers a wide range of trucks. Just confirm whether your glass is tinted or clear before ordering seals cut for specific glass. Find everything under weatherstripping.

OEM vs reproduction fitment: how to avoid buying the wrong part

Most squarebody parts sold today are high-quality reproductions rather than new-old-stock GM pieces, and good reproductions fit and finish beautifully. The key is buying from a seller that lists accurate year, model, cab, and bed fitment for every item. A few habits will save you time and money. First, write down your exact year, series (C10, K20, and so on), cab type, and bed style, then match every part against that list. Second, respect the 1973-1980 versus 1981-1987 split on grilles, headlights, dashes, and related trim. Third, always confirm left or right, two-wheel versus four-wheel drive, and whether a part is sold individually or as a set.

If you are planning a larger build and want to budget realistically, our squarebody restoration cost guide breaks down what to expect by category. And if you are ever unsure about a specific application, it is far better to ask before you order than to fight a part that was never going to fit. A quick measurement or a photo of your original piece usually settles the question.

It also helps to understand why fitment varies in the first place. Over a 15-year run, GM made running changes to mounting points, bracketry, and trim, and those small revisions are exactly what separate one year’s part from another’s. A reputable supplier captures that detail in the fitment notes, which is why buying squarebody parts from a specialist beats grabbing a generic listing from a marketplace that lumps every year together. Read the description fully, note any “with” or “without” options such as trim strips or tinted glass, and check whether hardware is included. Spending two extra minutes on the product page is the cheapest insurance you can buy against a return.

Frequently Asked Questions

Where can I buy squarebody parts?

The easiest place to buy squarebody parts is a dedicated specialist that organizes its catalog by the 1973-1987 body style and lists exact fitment for each item. At oemsquarebodyparts.com you can shop OEM-quality reproduction and restoration parts across body panels, exterior, interior, mechanical, and weatherstripping, then filter by your year and model. Start at the shop page or reach out through our FAQ if you need help confirming an application.

Are squarebody parts still made?

Yes. Because these trucks were produced in huge numbers and remain extremely popular, the aftermarket keeps a wide range of squarebody restoration parts in continuous production. Sheet metal, trim, interior components, mechanical wear items, and weatherstripping are all manufactured today as OEM-quality reproductions, so you rarely have to rely on scarce new-old-stock pieces to finish a build.

What years are squarebody trucks?

The squarebody pickups ran from 1973 through 1987, split into an early 1973-1980 era and a facelifted 1981-1987 era with a squarer grille, available quad or stacked headlights, and a redesigned dash. The related Blazer, Jimmy, and Suburban carried the same body style through 1991. GM introduced the rounded GMT400 “OBS” trucks in 1988 as the squarebody’s replacement.

Is a C10 a squarebody?

Yes, a 1973-1987 C10 is a squarebody. The C10 is the half-ton, two-wheel-drive version of the body style, and its four-wheel-drive counterpart is the K10. The same generation also includes the heavier C20, K20, C30, and K30 trucks. So when people talk about square body chevy parts for a C10, they are referring to this exact 1973-1987 generation.

Start your build today

Knowing your truck’s year and era turns parts shopping from a gamble into a straightforward checklist. Once you have that nailed down, the right squarebody parts are only a few clicks away. Ready to get started? Browse the full catalog on our shop page and get your 1973-1987 Chevy or GMC back to its best.