Its been a while since I posted but here goes. I have a 8.8 solid rear that was narrowed 2.5 inches per side to fit 17 inch 5 lug deep dish compomotive rims and SN95 calipers with Baer Eradispeed rotors. Would I need to go with different wheels if I converted to the IRS setup? Also can I use the calipers and rotors or are the IRS parts different? Does anyone know the two widths (Standard and pin drive) of the IRS setup wheel mount to wheel mount. Lots of questions. I did some searches but nothing was black and white.