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Reply to "245/40/ZR17 and 315/35/ZR17 on a stock body"

Those are max-width front tires for unflared front fenders. Some cars are worse than others in the full-lock turn clearance they need, for unknown reasons. A few only rub on the right side. As Chuck said, the 9-1/2" wide tread 245 fronts should fit but there WILL be some metal-massaging necessary, which can be done with a ball-pein hammer and some care. The OEM tires had 6" wide treads.

Some areas that rub only show up in full-lock turns, even at parking-lot speeds. Besides contouring the inside fender edges as mentioned in the Ford TSBs, the right side wiper motor splash shield may need modifying; Larry Stock has modified ones in stock with a core charge on your old one.

And removing the headlight-height/bumper-height spring spacers (U.S. only) plus any lowering or adding extra caster for more stable high speed handling may cause these minor clearance areas to need redoing. Caster pulls the entire wheel back towards the cabin, changing clearances.
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