1994-1995 Cobra brake booster/5 lug disc swap

Thought you guys could help me with this to since its in the same vein.

I'm doing a 5 lug all disc swap (as I said earlier) on my 1991 fox convertible. I'm using 99-04 spindles/rotors/PBR calipers up front and was wanting to run an IRS off a 03/04 cobra, but haven't had much luck finding a complete one in my area so far.

I recently ran across a SN95 rear brake setup for a fairly good price $350 shipped ($275 for actual parts, let me know if that sounds a bit pricey).

I was wondering if anyone knew the dimensions of the SN95 setup vs. the IRS setup??

The reason I ask is I'm stuffing as much wheel in the rear as possible and I wouldn't want the wheel sticking out in the rear when I eventualy install an IRS in the rear with the same wheels. I'm not buying anymore rims after I buy the 18" Foose Nitrous!