Back in the mid 70s, I had a 6 Fairlane GTA 2 door hardtop. I had L60-15s (about 275/60 15 with the metric tire designations) on MoPar Road Runner ralley wheels, which I believe were 7" wide. At the track, I had 9x28 1/2-15 Firestone Drag 500 slicks, on the same wheels. I seem to recall that I had to bend the outer tab down on the brackets that mount the rubber bump stops about the axle tubes. I may have had to roll the outer wheel well lips, but after 45 years, I can`t say for certain.