COVER PLATE, GEARBOX SPROCKET
Part Number 70-4577
1.370 ID for 70-4578 seal (All unit 500/650 BSA & pre 1968 unit Triumph TR6/120)
BSA 68-0238
1.370 ID for 70-4578 seal (All unit 500/650 BSA & pre 1968 unit Triumph TR6/120)
BSA 68-0238