NONE mustangII is a term that we used to use the stock mustanII fronend. Now forget it.It would be like using a corvair or pacer. Buy a mustang II kit and install it in 4 days and be done with it. I had the original mustang II under my 47 and changed it over to a progressive. World of diff and it does not use any part of a mustang II. Just a term nowadys. Foget the original.