get a rim that is made for your mustang
you can get common sizes from american muscle, or other websites
usually if its from a similar model year Stang, it'll fit. as long as its not something real crazy like 325's or 30" tall tires.
look at the outer tire diameter.
if it is the same as stock, no need to adjust the speedometer.
if it is different you will need a tuner to adjust the speedo.
is there a particular set you are interested in?
if so post the link and we can see if it'll fit.
if you're in no real rush, i may be selling my FR500's and Nitto 555's in a couple months or so. cheaper than anything you will buy new online.
