- 2023–2027 Factory-verified
only in: AT4; seat code A50, front buckets; included only with PCU; the upfitter lists read leather, level 3, Jet Black / Signet
HX6 Factory-verified
Documented applications
This page aggregates every documented appearance of HX6 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.