Triumph Pre-Unit Twins (Rigid) Gearbox Oil Filler Cap (1) - 57-0400 BSA Fork Straps Inlet measures 1 3/8" with

Inlet measures 1 3/8" with a length on 32"

There are many types of brackets that both Triumph and BSA used so use these measurements to make sure this will fit both your license plate and fender

This trunnion will replace Triumph part numbers 70-4148

and 37-2334

Replaces part number 40-0389 and 40-0391

Triumph Pre-Unit Twins (Rigid) Gearbox Oil Filler Cap (1) - 57-0400 BSA Fork Straps Inlet measures 1 3/8" withNew Triumph pre unit twins gearbox cover oil fill cap. This cap comes with a smooth "dome" top along with a polished alloy finish. Imported from England to replace Triumph part numbers 57 0400, 57 400, T0400 & T400 Fits most Triumph pre unit twins before 1951 with the proper gearbox as found on Triumph twins with rigid frames. Please check your parts book to ensure the best fitment. Please note that this cap is sold each as pictured **Features** Made