I modeled this with a 40mm gap to mount to an aluminum profile rig with 8mm bolts. It's designed to fit the footprint of the BMW sequential shifter with 5mm bolts with hexagonal reliefs on the underside at 8mm wide to hold the nut once threaded on the bolt.
Step files are included if any adjustments need to be made and links for the model's of the shifter itself
BMS Sequential Shifter: https://www.printables.com/model/371496-diy-racing-sim-sequential-shifter
BMS Seq. Shifter Add-ons/upgrades: https://www.printables.com/model/941957-addons-for-the-diy-sequential-shifter-by-beavismot
The author marked this model as their own original creation.