In case there's any doubt, you CAN replace the rollers in an Eichler door. We live in a 1961 model in Terra Linda. After getting courteous help from San Rafael Ace Hardware getting the existing roller assemblies out and measuring them, we ordered two of part # 5201132 (roller assembly) and from there it was easy.
I'm posting this because, when I called Arcadia, they told me the parts aren't sold anymore, and that I'd have to replace the entire door.
I was able to find these rollers, a metal version anyway, at Home Depot a few years back. I had my old plastic one and just brought it with me. There weren't many, I think I cleaned the place out for my 3 doors, but they did have them.