GU90706203 This oring is used in multiple places on Guzzis over decades:
Used on all of the Allen socket fill plugs used on the the transmission and rear drive units of nearly all models starting in 1977 through current production, including the entire V7, V7II, V7III and V9 line of models.
Also under the Allen socket cylinder stud access plug for the 12 o'clock cylinder stud on 850T and later 850cc, 1000cc and 1100cc models.
Also under the clutch hub on the transmission input shaft on Big Twin 750cc, 850cc 1000cc and 1100cc 5 speed transmissions.
And on the transmission output shaft between 1st and 5th gear on Big Twin 750cc, 850cc, 1000cc and 1100cc 5 speed transmissions.
Very common oring.