Same here, but had sufficient thread engagement with stock studs. No fender rolling with H&R Race Springs (w/ ISO's) and MT ET Street Radials 315-17's.
I run the LMR 17x10.5 with low profile bolts, Steeda ARP studs, 315 tire, and 1/4" spacer. I could run without a spacer but if the IRS hangs or the rear end gets light the tires will rub slightly. The SVT oem caps are a perfect fit.