O ring transmission layshaft between 5th gear and bearing (old)

GU90706219 This oring used in big twin 5 speed transmissions 850T3 and later, on the layshaft between 5th gear and bearing, or against shim 28217350 and the bearing. 850T3, 850T4, V1000 G5, 850 LeMans, LeMans II, CX100, SP1000, SP II, SP III, Strada, LeMans III, LeMans 1000 all years LeMans IV and LeMans V, 850T5, Mille GT, 1000S, California II, California III, California III injected, California 1100, EV, EV Touring, Jackal, Bassa, California Special, Special Sport, California Stone, Stone Touring, Aluminum, Titanium, Stone Metal, Quota 1000, Quota ES1100, 1100 Sport carb, 1100 Sport injected, California Vintage