I bought an electric window kit for my swinger from classic industries. It will be a while before I can install it but it appears like it should work and install easily. I did a quick test fit and it lined up on my door.
On these old regulators you need to go through the whole thing and replace all the worn parts. If one roller is shot it can cause all kinds of trouble. I like the electric kit because it eliminates a good portion of the factory parts.