Q21 ✓ Factory-verified

GMC · Regular Production Option

Wheels, 18" (45.7 cm), polished forged aluminum

Years 2024–27 Models 1 Factory citations 3

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Also documented for Chevrolet

Documented applications

Sierra HD — T1XX (2020–2027) →

• 2024–2027 ✓ Factory-verified

  only in: 3500 HD pickup and 3500 HD CC; the 2027 guides add a chrome center cap; 2024: GM Authority 2024 changes page

  ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of Q21 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.