Without spending much time looking for a perfect match, I bought a switch that looked similar to
THIS one from Radio Shack.
Using a hack saw, I shaved off opposite sides of the red button so it would fit into the back of the factory switch. I then used plastic epoxy to mold the three (any three) flat edges of the black portion of the switch (where the red button slides into the switch) to the factory switch (one end edge (the one closets to the center of the factory switch where there is a plastic rod like thing extending way out inside the black portion of the factory switch) and two side edges). And the wiring is simply inline with the single ground fed wire right at the switch.
It took a couple attempts before I got it right and in doing so, I accidentally broke off the factory spade and ended up having to crimp one on and force slide it into the factory switch (not much to solder to after it's been broken off.
The reason it broke so maybe you can avoid it:
I initially had it bent just right and was able to slide it back into the car frame with the Radio Shack switch molded on so the re-install was done. But it shorted out (the Radio Shack switch wire end was hitting the car frame on the inside). And in taking it all out and re-inserting I bent it too much and it broke off.
All said and done, it works like a champ.
