BSA Exhaust A10 Rigid & Plunger 1953-1955 by Admin | Jan 23, 2022 BSA Exhaust A10 Rigid & Plunger 1953-1955 Exhaust Pipes for BSA A10 Rigid and Plunger Models 1953-1955 OEM 67-2720, 27-2722 (reference only) Made in England from chromed steel tube size 1 1/2" B40