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These would be part number 10000097, 2 per car. Good luck, they're almost unobtanium and I know of nobody making repros. (the shims are p/n 10000099, btw. Amount per car- As required.)
Borrowed these pics from an old thread for reference.
You might find them on a clean southwestern model. I know I found a complete setup, for a friend, a few years back in a '79 Monte Carlo in an El Paso (TX) yard. Cars have really thinned out, though. Most are going to be either clapped out Wagons or Four Doors with no rear bar.