IMO: If the cars lowered as much as possible, and u still have massive wheel gap, try to find some 16" meshies lol, jk half kidding.
If u wrap the 15X7 in a 225-60...not only does it have a slightly taller sidewall than the 50, but its obviously wider...u might not like the way it looks on a narrow 7" wide wheel.
It would be sweet if u had pics, i honestly think i 60 will do that much difference...
unless u do that and drop it more or....end up getting 16s or 17s.
Good luck pimp