Rear Axle Length

Add 2.525 to both those numbers and you get the MAX length the axles can be.

25.3375
23.775

The other is to grab the inside edge of the side gear to get where engagement ends.

I can't get to any of the D60 Sure grips I have to measure.

My spreadsheet has a tube length, outside the housing to flange of: 14.5625 and 13.1875. The pass side number jives with yours, the drivers side doesn't BUT the overall is correct. so I'll assume the drivers tube side is right.