Just curious on this as I looking very hard at fitting a set of VXR rear discs to my Mk4. I have the calipers, in fact the calipers are the same as the Mk4 EXCEPT that the carrier is thinner on the mounting bracket. Anyone who's bought a set of Mk5 Lucas calipers will know what I mean.
The VXR has 278mm rear discs as opposed to the Mk4 standard 5 stud 264mm, so a 14mm difference, not earth shattering but worth having if you've already uprated the fronts.
I'm looking at getting a local engineering firm to make me a pair of the beam brackets so I can fit the larger discs, if the cost is not too expensive I may have a few pairs made up. The VXR rear discs are approx £58 a pair with my Vauxhall Trade club discount so those are cheap enough. The beam brackets BTW are £80 EACH from Vx.
So anyone think the expense is worth the effort?