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i found some tires that are 30in overall,11.5in wide,i know i have to tub my car and change over to coil overs but will i have to modify the wheel openings (quarter panels) on my 69 cougar to fit these?

if the 30in tires will not fit will 29in tires fit without modifying the wheel openings?
 

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Best guess is no. Ford/Mercury had trouble with room in the fender areas putting tires in the G60 sizes on many cars in the 70's. Probably can get by with the 30" tall tire, but the width is probably going to have to be less than 10". Spcially if driven on the street where body roll/sway will cause the tires to rub on the side walls.
 
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