With a relocate kit and a Abody 8.75 you are looking at 7.5bs. There may be something more ideal. That is what I used. I would measure for your final purchase. Each car is different. and when you are really trying to makes the most of that space you want to measure. Also, the BS and wheels available now compared to a decade ago has changed dramatically. My new rims are 11.27" wide with 3.5 backspacing. That simply wasn't around when I built my first dart.