When I used to work at a Guzzi shop years ago we used to order our V-twin parts from Valpolini in Mandello.I was told that all the guys from all the small suppliers would meet up and swap stuff about to keep their customers happy.
I had been asking for ages if Valpo could supply Dellorto handlebar choke levers ( I needed one for my Ambassador to replace the non-stardard Amal one) always to be told they were not available.When I visited Mandello on holiday I of course visited Valpolini's to say hello,also asking again about the choke lever.Sorry,still no longer available.Later,standing outside Stuchi's window (just up the road) I saw a lever.When I asked inside if I could buy one they said sure,how many did I want!