fits 350, 500 and 650 cc Unit Construction Pan Cake / Pancake Tiger 100 and T100SS Unit Construction Sept. 1959 09/1963 3TA. 5TA. T90 Half Bath Tube 6T 1963 onwards TR6 09/1965 -1970 BSA A50. A65 Single Carb. Mod. from 1962 onwardsOD: ca. 118 mmID: ca. 85 mmH. 42 mm