Dellorto 8678 mixture screw o-ring all PHF and PHM carbs

Dellorto number 8678 oring, mixture screw o-ring used on Guzzi models with PHF 30, 36 and PHM 40 carburetors. This little o-ring seals the carburetor body at the mixture screw hole using washer 8260. Used on all PHF 30, 32, 34, 36 and PHM 38, 40 and 41 carbs as found on Ducati, Laverda, BMW, Harley and no doubt other brand bike applications.