Thanks for the replies. I don't mean to sound disappointed in the car, just disappointed in the seller. I love these cars and this one is going to be restored.
I'm in Las Vegas, I'm a radiation physicist but my first life was a diesel mechanic in the USAF. I just finished restoring a C4 corvette; it's sold just waiting on the buyer to arrange shipping. The Pantera is for me though so it's not going anywhere.
I have a rough plan for restoration but I'm concentrating on the safety items so I can drive for a little while before she goes down. The brake booster just failed yesterday; i'm actually impressed with whoever was able to prep this car for selling and have all these hidden failures waiting for me less than a month after purchase.
Anyway, I made temporary seat rollers out of 1" steel washers, 1"PVC pipe and epoxy resin. The washers provide support, the epoxy resin binds them and can flex a little. Definitely temporary.
Epoxy resin doesn't bind chemically to PVC so you can just cut the pipe off and clean up the lip. In the future I will finish burning the old rubber out of the original rollers and fill with urethane window weld or similar.