Tank mounting rubber to suit:
Triumph
500cc 1964 - 1974,
650cc 1964 - 1974,
750cc Triples 1969
BSA
A75 Rocket 3 1969-
Norton
Dominator Featherbeds.
Single spigot rubber with 8mm hole
Outer diameter 1"
Outer small diameter of 19/32 with a large boss of 9/32 and a small boss of 1/4"