This is the low profile, screw on, vented, fuel tank cap that fits underneath the various locking covers that Moto Guzzi used over a period of more than a decade. Chrome plated steel as original. Used on many models with locking fuel cap access doors: 850 LeMans II, LeMans III, CX100, V65C, V65SP, V65 Lario, California II, 850T5, 850T4, Mille GT, Strada, SPIII, V50 Monza, V35 II, V50 III, V50 Monza, LeMans 1000 all years Lemans IV and LeMans V, late Convert, V1000G5, 1000S, 1000SP, 750 Targa.
Also a substitute for 28103946, 28103945
And some older Guzzi parts references indicate that this cap was also used on some small displacement Benellis, such as 125's and 254's. These were also badged as Guzzis.