I made a 400.00 mistake

[Mr Chevorlet]

I bought a rear axle but i did not measure the leaf spring purches cause i thought if it was comming out of a leaf spring truck it would fit. (NOT).
But now I need to know if 1971 and 1972 gmc and Chevy trucks 2 wheel and 4 wheel drive leaf spring rearends are the same width. Or is there a chart to show what trucks will interchange and match my 72 4 wheel drive C10 leafspring pearches. I have searched but couldn't find anything. Now I have a rearend that not going to fit easily like I wanted.
thanks for any help.