finally foun some that will work at local carquest part no 53-19410 these work for the large hole switches not the small ones they were lik 7 bucks a piece
I'm 7 years late, but thanks for posting that number. I just ran into the same problem with my 73 Swinger. The switch on the passenger side is missing, so I ordered one from RockAuto and the threads are too small; the switch just falls into the hole.
This one is actually for the driver's side because it has the double contacts with blade terminals, where the passenger side should be a single contact with a bullet style terminal, but at least the thread size should be right.
If someone knows a number for a correct single contact switch with the large size threads, please let me know. Otherwise I'll get one of these and crimp a new terminal on the wire in the car to make it work.