I'm planning to buy 18x10 Bullitt Wheels for the rear in my 2003 Mustang GT and for tires size im gettting 285/40/18. Got two questions, do i need wheel spacer this rims? would the rim still pops out without the wheel spacer? are the tires size 285/40/18 good? im planning to lower my car. would it be a problem with this tire size?