Get whatever your stock diameter size is. Look up your stock size on tire-rack, click any tire that comes up, click specs and look at the specs/other sizes.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.