Description
On early Twinspark gearboxes there is a drive for the speedo encoder. The boss that holds the drive in place has a groove for a o ring. On later gearboxes there is no encoder drive but the boss with its o ring are still there. Whatever the age of your gearbox if it is leaking oil from the speedo drive is or used to be this is the o ring you need.
Shown in the exploded view as part of the speedo drive assemby
Price is for one o ring