Hi Joe
1950,s french bikes are a bit late for me, i,ve only got 20,s and 30,s stuff which is a lot harder to find bits for.
E Bay france is your first stop for parts also Leboncoin is another good site in France, compare prices with other stuff similar to what you want first, some times they don,t have a clue what things are worth so you either get a bargain or they just put a big price on it and see what happens.
Don,t use google translator, use Bing translator, it,s free and does the job spot on.
For any info you want go on the LVA Moto - Forum, there are guys on there like Loulou32 who can answer your technical questions in seconds, they are extremely helpful guys, any problems e mail me at mickc@mickc.karoo.co.uk.
Cheers