Just bought some new repro rear window quarter mouldings from an eBay seller in the US. Had a very positive experience. The item was shipped super fast and he even refunded the difference in postage between what was originally quoted in the auction and the actual postage cost.
Only downside is that he doesn't have a large variety of parts for sale.
His eBay ID is 1964ponycar.
Cheers,
Frank.