The opening in the restraint plate is 12.250" x 4.00" and uses laceable straps that allow the racer to use the restraint with many different motor combinations. The strap tabs have been bent down to clear barrel valves and fuel injection lines.
If the racer needs SFI straps for the restraint plate #1210-0007A or #1210-0007B. Fits 6-71 thru 18-71 roots superchargers.