Tom:

I have an '88 Carrera and have bought things from Pelican
Parts and give them a good rating.

Porsche sells a CD of all their parts for all models
and now also has each model on their web site that you can
download.  (All PDF files) See, for example:
https://techinfo.porsche.com/techinfo/VFModuleManager?Type=MainFrameSet
then pick USA, then Workshop Info, then Genuine Parts-Catalogue.
(It didn't seem so hidden a few months ago.)

Now that Porsche is controlling VW, maybe....

Richard
Boulder