Are you looking for VW parts or MGTD (FiberFab) parts?
VW parts- check out http://www.thesamba.com/vw the number one place for anything VW. Check thier banner ads for suppliers and search the forums for feedback
MGTD(fiberfab) parts- read through my guest book and find the info for MG Magic in FL. Maybe search the foums also, surly someone has posted the info. The don’t have a website.
Moss Motors and other vintage car suppliers have parts for the real MGTD’s that will also work well with the kits as the kits were designed and supplied with many origoanl parts for the real cars.
Hope this helps, and welcome to the club.