1> Wings are no longer available but you may find some new old stock that people are selling. They wont be cheap tho - i just bought a new pair for 400 quid

2> I would use poly bushes.

3> Cloth not available but search ebay for a set of seats and use the cloth from that.

4> Loads of cosworth breakers around - do a google search. Beware though as alot of the traders want top money for their parts some of which are only fit for the bin lol