not quite as old-school as most but I have a set of mk2 golf Pirelli P-slots if you're not after dish...
oh, I don't think it's as easy as redrilling disks on the watercooled stuff, they have separate hubs and the disks are fitted over the top, similar to the rear of a type3 or bay window hubs. Most guys use adapters for different stud patterns. I'd say Ebay would be your friend for adapters.
there's also a set of Ronal Turbos for sale on vagdrivers. Not exactly old-school but definitely a sweet wheel...