Triumph 350/500cc Unit Siamese Exhaust Pipes ID at Cylinder head end 1-1/2” Cylinder headOD at end of pipe 1 3/8" = 35 mmsuitable silencer BOA-STR1S-S/LHS. TR1S.Please look at all pictures
MSS Viper Venom Clubman 350cc (MKI and MKII) Scrambler 350cc Clubman 500cc (MKI and MKII) Scrambler 500cc Thruxton Endurance Made in England by Velocette Ltd.