From what I understand, the interfeerence is only at full suspension droop. Some people grind the offending bolt down for clearance and others have used a 1/4" or so hubcentric spacer for clearance. They look bad-ass on the edge cars:
This is a post over at SVT performance where a guy is selling thew spacers and another guy is looking to get into manufacturing them:
18x10.5 AFS '03s with 295/35/18s on my '01 Cobra. Lowered with Eibach Pro-kit (front springs cut 1/2 coil). No IRS bolt interference. Looks amazing and endless compliments. Only thing I'd change is that I'd use a larger rear tire (315/30 BFG or 305/35 Nitto). Go for it. Later, James
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