Hi Pb57, try Suffolk Sports Cars, the front wings (fenders) should fit a genuine SS100 or a replica, maybe out of the box, maybe with some mods.
As they're a business they will quite possibly be happy to sell you a pair but they won't be cheap, especially if you need them shipping across the pond(?)
http://www.suffolksportscars.com/pag...100jaguar.html
Good luck finding what you're looking for.