Dimension of stock rear end

Does anybody know what the measurement is from WMS to WMS for a stock duster rear end?

WMS = Wheel Mounting Surface

I am trying to consider my options for a new rear axle and it is seeming impossible to locate an affordable 8 3/4. I do however have a line a Ford 9-inch that is very affordable and has the gearing I am looking for but I need to know if it close in width.

I remember reading that someone put an 8.8 from an Exploder in, so I am hoping this will work as well.

Joe O