'73 and older...
... maybe I can help answer the question about '73 and older. If stock, I believe your lap belts attach at the seat rails - not the rocker panels. If you want, you can upgrade to have the receiver (outside) welded into the rocker panel like the '74++. I had mine converted (outside and on the tunnel) because I wanted to be strapped in tied to the chassis and not the seats and those small bolts.
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