This is what i found searching google and thirdgen numbers seem to vary so trying to get a better est. of track width of front and rear?

"The 3,208 pound 1986 IROC-Z was 192 inches long, 72.8 inches wide and 50.3 inches tall. Its wheelbase was 101 inches. It had a front track width of 60.7 inches with a rear track of 60.6 inches. The car's turning circle took 39.4 feet."

"Approx. 57" from backing plate to backing plate and 62" from axle flange to axle flange. "

"Front track
The distance between the centers of the wheels on the front

59.9606 in (inches)

Rear track
The distance between the centers of the wheels on the rear axle.

60.9449 in (inches)"

 

Use a tape measure.

 

thanks pointing out the obvious
but yea just being lazy had my car up on jacks and totally forgot to measure it

i will today since numbers vary everywhere i search

 

61inch front
62inch rear