Help on shortening a Dana 60 truck housing

DoctorDiff said
If you make the driver side tube is 1 3/8" longer than the passenger side tube, you will yield a stock 1 3/16" Mopar passenger car pinion offset.

My axle/housing calculator above makes it easy.

I did try your calculator till I got to the point of measurement A and B that is what I didn’t know.