Cab back panel insulation (73–87 list); "rear floor mats" in GM lists

Years 1973–82, 2017–19 Models 2 Factory citations 3

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Also described as Floor mats, carpeted, front and rear, deluxe

Also documented for Buick Cadillac GMC

Documented applications

C/K Trucks

1973–82 Disputed

Reused/conflicting

Sonic — first generation (2012–2020)

2017–2019 Factory-verified

part of the RS package (WFK): S on the 5-door LT and Premier (not the 2018–2019 LT 1FL) and the Premier manual sedan, O on the LT and Premier automatic sedans

GM factory document — 2017 chevrolet sonic order guide copy gm authority, p.62.
GM factory document — 2018 chevrolet sonic order guide copy gm authority, p.68.
GM factory document — 2019 chevrolet sonic order guide may 4 2018 copy gm authority, p.61.

This page aggregates every documented appearance of B54 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.