Looking for some specs on the total width of the body on SN95

[SVTstang96]

If you dont already know I am in the planning stages on my IRS swap. I want the wheels to fill the rear and have started to calculate the spacer size I need. I will be running 04 Cobra rims on a 04 Cobra IRS in my 96 Cobra. So far with the offset of the rims, width of rims, and Irs I have a track width of 6' 9". Does anyone know the width of the rear from outside of quarter panel to quarter panel? If not Ill snag one off my car one of the days I am free.

Thanks!