LPO, rocker protection

Years 2018, 2023–26 Models 2 Factory citations 5

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Also described as LPO, Rocker guards

Also documented for GMC

Documented applications

Silverado HD — K2XX (2015–2019)

2018 Factory-verified

dealer-installed; 2018: GM's 2018 Silverado 2500HD order guide

GM factory document — 2018 chevrolet silverado 2500hd order guide copy gm authority, p.34.

Silverado — T1XX (2019–2026)

2023–2026 Factory-verified

GM factory document — 2023 chevrolet 23 silverado 1500 electrical body builder sm en us 2022oct24, p.12.
GM factory document — 2024 chevrolet 24 silverado1500 electrical body builder 2023nov29, p.15.
GM factory document — 2025 chevrolet silverado 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 1500 retail and fleet fleet order guide rpo codes, p.1.

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