No idea, I bought eibach sportlines!!!
you might get an extra 3mm with the H&R's, but I'm sure they're supposed to be stiffer, and cost an extra £85. I couldnt justify £85 for 3mm
When my dampers die anyway, I'll be getting some Koni FSD's or H&R B8's, these springs are matched to go with the B8's anyway in the B12 Kit, so youre money at the end of the day.