After researching this one to death I bought 15x8 rally IIs from Summit. By the time I added up the cost of getting rims, then painting them plus add up my time to do it and the fact the summit rally II are wider and powder coated it was a no brainer. Your 14x7 would be a 70 seris tire and the 15x7 would be a 60 series tier and they should be the same hight if they are changed out for the same width. They say on this site don't go any wider then a 235 on the front and you should be good to go.