53 Buick Solid Spoke Steering, horn components help

Also posted this under "Shop Talk." Maybe more help here:

Anyone had experience with this? There are some missing pieces, that don't seem to be manufactured anymore. I believe I am missing:
1. some kind of spring under the horn cup (attaches to plastic steering wheel housing and pushes up the cup.
2. a strap that goes on top of the horn button piece connected to the wire. It is called a retainer in other horns, and might be a few pieces, a strap with a retainer on each side.

Anyone have a pic on the missing parts or a lead? Have searched and called some.
Any universal kit that will do the trick?
The insides were all wrapped with electrical tape to keep the horn from activating all the time.
Thanks.

Problem not yet solved, but here's another piece of the horn. The contact "strap." The retainer is the rubber around the horn emblem/button. Still not finding a picture of the spring part under the horn cup.