I had to try myself so got a used set of rs5 rears for free from my Reno dealer. Test fitted them today when I was doing my rs6 rear upgrade just to confirm. Perfect fit. Offset is only about a 1mm difference which will not affect much. Just another option for those who may want to run for example an rs5 rear 330mm 2 piece girodisc…
S6:
RS5:
