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Hope this info will usefull:

Made redrawings with:
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Reference Information:
3.125" - 79,375 mm - distance center to center across top
2.687" - 68,25 mm - distance center to center across bottom
2.437" - 61,8998 mm - distance center to center top to bottom
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@Navy Lifer 's measuments using Starrett dial caliper from an actual backing plate:
Register diameter 71.88
Holes are 0.375" = 9.525mm.
3.76" = 95.5mm (96.72 on drawing ) - center to center of flange bolt holes - top (wide) to bottom (narrow) diagonally
1.88" = 47.75mm (48.36 on drawing) (radius - center of tube to center of any bolt hole)
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Bolt mounting holes 3/8" or 9.6mm

Drawings this is not confirmed on actual rear axle end!

196436
 
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