look for a 2006 mustang gt rims. youll find these w/ a 5x114.3 bolt pattern (fits our cars) 18x8 and offset +45.

also, check out sport edition f10. they look really nice, would def look good on a grand prix and comes in 5x114.3 18x8 +45

18x8's fit fine. u shouldnt run into issues as long as the offset is over 35.