Overhaul Vespa Sprint Veloce question

Hello everybody!

I would like to overhaul my Sprint Veloce '78 engine but I can't find the right parts. For instance: there are two types of bearing who fits a veloce according to the discription. Same with the gaskets and oil seals. Can anybody advise me what I need for the overhaul and witch items I have to order. Thanks!

Greetings,

Daniel