Leaf spring rear ends don't have the pan hard bar, because they can't move around like a coil spring rear end can. Hope this helps. I had a junk yard tell me once that a leaf spring rear in a 67 thru 72 are the same as 73 and ups. Have never measured them though.
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Andy
71's Are for ever!!! or 67,68,69,70,72
http://geocities.com/chevy71tpi/main.html