After four years, my underhood resto is finally complete.

Thank you for trying to help me, guys.
I'm sorry for having polluted Cruiser thread, but as he has had his booster rebuilt, I hoped that he has a solution for me.
I already have my own post talking about this problem, but it's a dead thread now
Brake booster compatibility?

@Dana67Dart : about the Classic Industries kit, I've found the same one, but cheaper at Harmon Classic brakes ($240.95):
https://www.parts123.com/parts123/yb.dll?
parta~dyndetail~Z5Z5Z50001029z~Z5Z5Z5AABIN~P240.95~~~~S6KJ1FE8BN17613815725b~Z5Z5Z5~Z5Z5Z50001029z
I think that I'll go with this kind of solution, a local refection here with a kit from USA.

I also found a generic booster/MC tandem for sale on ebay. Don't know if it's compatible with my Demon. I will ask the question in my own thread.
Francois