The 15x6.5" Ford wheels I had with the stock wheel covers had 4.25" backspacing (215-70-15 tires) and fit like the car came stock with them.
The 17x 7.5" Mustang wheels I now have have a 5.625 backspacing on the rear, lots of clearance, I'm thinking of adding 1" spacers just to move it closer to the fender. I have a 1" spacer in front so the backspace is 4.625". The only interference Issue I had was due to the diameter. The rim would just barely contact the upper king pin pivot zerk fitting. I replaced them with a plug to solve it. I just swap the plug for a zerk to grease it then put the plug back when done.
The 17x 7.5" Mustang wheels I now have have a 5.625 backspacing on the rear, lots of clearance, I'm thinking of adding 1" spacers just to move it closer to the fender. I have a 1" spacer in front so the backspace is 4.625". The only interference Issue I had was due to the diameter. The rim would just barely contact the upper king pin pivot zerk fitting. I replaced them with a plug to solve it. I just swap the plug for a zerk to grease it then put the plug back when done.
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