there were two different styles of the thick steel (nut) pieces w the tang. Ones that were threaded, & ones that were mated to a long spring steel type clip nut. In my experience taking '70-72 parts & project cars apart, it's the stamped steel nut, #13, that's tough to come up with.
Need to order the '72 A-body assembly manual, my well worn '71 assembly manual has slightly different illustration
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