I haven't spent a ton of seat time in the C70, but I was looking at one in Europe wiht the alcantara interior, and the seats looked identical to the ones in our 850R.<P>That said, we have some wet okoles in our Project Golf 1.8T on VWvortex. Having installed them several times, I can tell you that you may have issues with whatever lever is on the C70s seats to make them fold forward. We tried installing our 4door golf seat covers on a two-door golf, and there was no hole for the lever. You can make do, depending on the release design, but I'm not sure how easy that'd be.<P>Also, I'd guess the rear seat won't fit as I think they are quite different.
The C70 seats have larger side bolsters. If you get a chance, swing by your local dealer and see if they have one on their lot. <P>If the seat cover is made for the C70 it may not fit snug on the S70 seats.