The Supra FX One Board Rack Adapter allows any Roswell board rack equipped with a swivel to mount to the FX One tower on any 2018 and up Supra.
Just bolt onto the existing hole pattern in your tower and choose your favorite Roswell swivel board rack. The Supra FX One Board Rack Adapter provides ample clearance through rotation of your swivel board rack from the tower and accessories.

Sold as a pair (you will need to purchase two if you have four racks), and includes all hardware for installation.