8 3/4 axels???

i actualy just found another rear complete. so i am gonna try to get it and just run it for now while i mini tub and all. so what would you suggest to cut the housing to? i wanna run 12.5" wide tires with the mini tub and spring relocated. i will call him tommorow and see if he already cut them or what maby have him wait till i decide how wide to make it. if i read it right cb said about 51.5" is that good for just the housing?