I saw you didn't have any photo with these on a R34, as I have these on mine I thought I should be kind and post a few pics for anyone interested in XXR 527 wheels.
My setup are 18x9.75 ET20 with 255/40-18. If I didn't have had the tires left over from my last set of wheels I would have gone with 265/35-18 or maybe even 275/35-18.
Spacers are also needed to get the sit really good, I still use the without as I still have the stock wheel studs.