Axle flip help ...please

D100 8 3/4 housing, flange to flange

• '65-'71= 58 5/16"
• '72-'74= 59 7/16"

D100 8 3/4, drum to drum (wms to wms)

• '65-'71= 63 15/16"
• '72-'74= 64 3/8"

An accurate 8 3/4" rear axle width list

Those are what I have specs for. If it's later than that, you can probably assume it is wider than what is listed...