Seller says this vehicle has the 1SU option

What is a GM build sheet?

A build sheet is General Motors' own factory assembly record for a specific VIN. It lists the RPO (Regular Production Option) codes the vehicle was built with — every package, individual option, paint and trim selection, axle ratio, and equipment group — exactly as it left the plant.

Where a window sticker is written for the buyer with plain descriptions and pricing, the build sheet is the underlying code-level truth. It's the most reliable way to confirm how a used Chevrolet, Buick, Cadillac, or GMC was originally configured, long after the original paperwork is gone.

Window sticker vs. build sheet

Newer GM vehicles (roughly 2020 and later) usually have the original window sticker PDF on file — the Monroney label with standard and optional equipment, fuel economy, warranty, and the full MSRP breakdown.

When a window sticker isn't on file, this tool automatically falls back to the build sheet: the list of RPO codes with their descriptions. Either way you come away with the factory record of how the vehicle was equipped.

RPO codes explained

Every factory option on a GM vehicle has a three-character RPO code — for example a specific paint, a tow package, a sunroof, or an audio system. These codes are also printed on the label inside the glovebox or spare-tire well.

The build sheet pairs each code with a readable description, so you can translate a glovebox full of codes into the actual packages and features the vehicle carries. That makes it easy to verify a seller's claims or settle exactly which options are factory.

Seller says this vehicle has the 1SU option

Packages & Towing · 2020 Chevrolet Camaro · 875 views · 1 reply

1SU — Option package 18. This code identifies a factory option package; its exact contents may vary by model and model year. Browse RPO codes →

Brian M. May 7, 2026 · Wisconsin

I am considering a used 2020 Chevrolet Camaro. The seller says it has the equipment associated with 1SU, and the code description is “Option package 18. This code identifies a factory option package; its exact contents may vary by model and model year” What physical details should I inspect to make sure the listing is accurate?

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Daniel C. May 10, 2026

Before buying, I would inspect the relevant component and take a photo of its label or part number. That often resolves whether the vehicle still has the factory configuration associated with 1SU.

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