If you are not done, ie you can still modify it, there were some narrower ends used on certain rear ends, they were about 1/2 the width of normal ones. I built my last 60 with a pair of them. If I remember, they were on early 70's B-vans, I may have a couple more sets if you can still modify. Some of the aftermarket ends were narrower, also, other wise its one of the options listed above. Jim.