The right wheels, as in lower offset? is that not exactly the same as using spacers? if the op wanted to fit a different stud pattern wheel he would have said adapters and not spacers.
The someone at a trackday shouldn't have bought cheap/unbalanced spacers. Probably the 4/5 stud multi fit type
Using the one case study equals the general rule theory you tend to use, I have used spacers on the rear of mine on most of its trackdays with no problems, and the rear bearing design on the mk2 is pony compared to the front. Pictures of it going on track with r888's on shows the rear wheel toe differing either side through flex so they have a bloody hard time
