- 2016–2018 Factory-verified
2018: 1SL, 1SN, 1SP; front bucket seats (AR9); the 2016 and 2017 guides say Chestnut Brown
HHG Factory-verified
Documented applications
This page aggregates every documented appearance of HHG in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.