To my amazement they fit! Heres the spec for anyone who is interested in fitting XXR 527 alloys.
18" x 8.75J ET20 on the front with 225/40/18
18" x 9.75J ET20 on the rear with 225/40/18
Camber is set to -2 but going to go more as it rubs slightly when going over speed bumps or turning tight at speed.
No arch work, HKS Hipermax D suspension