Is there a source for the solenoid - this is the unit that mounts on the left firewall (to the left of the engine as you face the rear of the car).
Nothing "new" that I know of, unless you find an extremely rare NOS one, or the also very rare 3 rebuild kits for the one you have. Otherwise you'll have to hunt down a good used unit. They pop up on Samba from time to time at various prices. ($25 - $100) I think there is at least one on there now.
BTW, if you have a dead on, I would be interested in purchasing it. (I want one to take apart and see how it works.)
Good luck!