Well, necro'ing isn't a bad thing, right?
My rear seat doglegs went to hell a long time ago (20 something years?) and I've never been able to find a replacement part at a price I'm willing to spend. I did recently pick up one of the doglegs from a later model (mine's a 76 and the other was a 77 or 78) that should match up fairly well, I hope. My thought was to learn how to do fiberglass and do a mold and try to figure out how to do an inverse for the other side. Money's been tight as have time and space so I haven't gotten around to it yet, but it's on the plan for this year.
If there's another option, I sure would be glad to hear about it, though!