rear 12 bolt width

[morpheus]

i've searched high and low and can't find out how wide a rear 12 bolt is ? if this is answered somewhere else just point me to it. thanks.

- jack

 

[ChevBlazin]

I just bought a 12 bolt yesterday out of a 79 chevy truck. It is the same width as the 10 bolt in my 86 Blazer. If that helps at all. something like 56 1/2" to 57" from backing plate to backing plate? dont quote me I don't remember for sure.