Ok what's the biggest size to fit on the 15" 10 holes?

[Chevyguy]

Inspired by the smallest snow tire question.

My 90 needs new back tires. My 74 Laguna has 4 barley used Pep boys Futura GLS tires on it and wont be on the road that soon. I have 245 60R 15 on front 275 60 15 on rears on Chevy 15X7 Rally wheels. I also have a set of 255/60 15's with minimal tread, hmm what could I do with those??

So anywaysvI know all those tires will go on a 7" rim, but what 15" sizes fit well on the mustang,

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Frank W
90 5.0 LX coupe Stone stock soon to be daily driver
74 Chevy Laguna Type S-3 305 apart in garage, getting a 454 to put next to it
www.chevellepages.com/folingo