I don't have a clue. Did you look in the seat springs for the build sheet? It will tell you an awful lot of you can get it intact. And yes they do show up and can be preserved on old car. I found the one on my '53 stude I was amazed at the options that the car came with. Anyway that should get the old juices flowing. OK I just figured it out you don't have a caddy you are using a caddy mill in your old hooptie and building a trad rod, right?