Here is ( for example ) one ign switch with instructions sheet, made for several diff 70s setups.

https://www.oldsobsolete.com/products-pa...rg-warner-cs82/

Good priced if you ask me BTW!

If you get it, get the instruction sheet scanned of pictured for tech references around! ( send to me LOL )

Several replacement switches got a diff rivets disposition on backelite, maybe due the extra functions like the think black wire mentioned ( which I have no idea of year and apllication ), but fits and works the same on steering column collar

( EDITING: nevermind, says out of stock )