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Well, let's see:
For really good quality Porsche parts (but quite expensive), try http://www.stoddard.com/
Next step down in quality/price: http://www.automotion.com/
Rubber/trim parts: International Mercantile at http://im356-911.com/
For general/performance Volkswagen parts we mostly go to cip1, SoCal Imports or Mid-America Auto parts
However! Most of us go with reproduction parts for our reproduction cars, because the real Porsche parts are so very expensive. That said, you could try three of the most popular replica builders for whatever parts you need:
Intermeccanica at http://www.intermeccanica.com/ (their site is temporarily down for maintenance)
Beck at http://www.beckspeedster.com/
and Vintage Speedsters at: http://www.vintagespeedsters.com/
Good luck!
Also: www.fibersteel.com
http://www.sierramadrecollection.com/store/cart.php
(note that Russ at Fibersteel has been involved in some past activities here at the S.O.C. and would probably do right by you)
Here's another in California that is reputable:
http://www.pelicanparts.com/ca...DYext_pg4.htm#item19
Another: http://www.stoddard.com/shop/s...at=Badges+%26+Plates
(I believe these cater mainly to "original" Porsches; hence prices might be a bit more-best to compare sources)