Hello Folks, anyone know a source for the big wiper gear for the variable speed motor? Mine needs replacing in my '70 Challenger.

Also, I can't get it to park correctly. I noticed a piece of plastic is broken from that big gear, so I'm hoping that's at least part of my problem. The point on the front round plate appears intact and functional. I also tried another switch and that didn't help either, although I can't be certain the other switch was 100percent working, but it did carry through with the parking problem. The wipers will just stop wherever the power is turned off or ignition is stopped.