Just after abit of advice really, I have a B6 and am currently "trying" to do the B5 S4 front brake conversion. I believe there is an early (bolt in brake pads) caliper and late (wire spring pad retainer) caliper. Are there any performance differences in these calipers? Reason I ask is that I stupidly made an offer to a bloke outside of ebay who had a set of the later calipers advertised with the wire spring pad retainers - they arrived today, he has sent me a set of early calipers. If performance is the same then I will keep them, but if not then I will have to go about trying to get some money back. Many thanks.