The correct seat adapter for your 2022 GMC Sierra 1500 Denali is the RoadMaster BrakeMaster Custom Seat Adapter # RM-88348. This will allow you to mount your BrakeMaster supplemental braking system. I also recommend the following for a complete setup to flat tow your 2022 GMC Sierra 1500 Limited Denali:
Base Plate- Roadmaster Direct-Connect Base Plate Kit - Removable Arms # RM-523198-5.
Tow Bar- Roadmaster Nighthawk All Terrain, Non-Binding Tow Bar w/ LED Lights - RV Mount - 8K # RM-676.
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