Not enough backspacing. Stock 8" wheel has that backspacing. Adding an inch & a half will only push the wheel/tire outside the fenderwell.
If 15x8 Racestar wheels with 5.50" backspace fits and a 15x10 with 7.50" fits why would a 15x9.275 with 6.5" not fit?
The 9.275 is also available with 7.5" backspace.
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