Locking fuel filler cap with 2 keys for most early Tonti frame Guzzis, including Convert, 850T, 850T3, LeMans I, LeMans II, late V7 Sport, 750S. Some late Eldorado. This version was used as original on some California III and carbureted California 1100. Sealing ring outer diameter is 48mm.
Also references as part numbers 30103961 or 29736960 or 29736961
or 29103951 or 30103960
Similar caps were used on many Italian motorcycles including Ducati, MV, Laverda and Moto Morini during the 1970s. Be sure to measure the gasket outer diameter for these applications.