If I remember correctly, the flasher has two spade terminal connections? On my Silver Star, I used a generic 552 flasher that is available at any auto parts store.
There are also electronic versions for a few more $$.
Charlie '69 Guzzi Ambassador '71 Guzzi Ambassador '72 Benelli 175 Enduro '73 Guzzi Eldorado '76 Guzzi I-Convert '77 Morini 3 1/2 Strada '81 Ducati 500SL Pantah '82 Moto Guzzi V50 III '97 MuZ Skorpion Tour