There was an after market one on my 53. I took it out as I did not need it. The water resevoir/tank mounted on the firewall and there are presently two very discreet black plastic nozzle/outlets on the cowl. The pump motor was incorporated into the tank and a wire ran thru a fuse to post on my fuse block which I think went to the ignition switch. My fuse block ia also an ad hoc job. (the hole wiring job was a snake pit as mentioned in my post about dim headlights!)The push button was built into the choke cable hole in the dash. The choke was put into the throttle cable hole! I never used it but still have the parts if anyone wants them. Of course I had to leave the plastic nozzles in place as I was not ready to fill the hole and paint it. Sorry no pics.
