Can anyone tell me how wide a 68-69 chevelle 12 bolt rearend is, from backing plate to backing plate? Thanks

Can anyone tell me how wide a 68-69 chevelle 12 bolt rearend is, from backing plate to backing plate? Thanks

Chevellestuff gives the measurement you want, here's the link. Scroll down near the bottom and read the paragraphs for widths.
http://www.chevellestuff.com/generic/axlecodes.htm#1966

I've found the easiest way to id a housing is by the casting number which you can also get from the link above.