5/8"bore-Fitted to all Cooper 'S' hydrolastic cars from Sept 1964 plus mini to 1967.Also used from 1959-1963 and intermittently on.Leyland used this smaller type cylinder with servo on disc set ups as standard.

Bleed nipple now 7mm spanner size but same thread-original 513118A used to be 6.2mm (1/4"). USE 660510 Bleed Spanner