I had a set of ROH ZR6 wheels 16x8 with 245-50-16's and 245-45-16's. the 45's fit better on the 89 (smaller fender opening at 9:00 on the driver's front fender...).
Here are some "older" photos of my car
HERE
Unlike the newer phots of the 17x9-1/2" wheels 275-40-17's on all four corners in my sig.
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Darius Rudis
Roadracer: Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page