Help on shortening a Dana 60 truck housing

I have a truck housing that I want to shorten to stock A body width. Now I know a stock A body width is 52 5/8”. But I need help on what the left and right axle tubes should be to have the right center offset. My first attempt at shortening a Dana 60 truck housing. I have a set of 3.54 and 4.10 gears. Still looking for a Track Lok unit. Any help is appreciated.