Brake light switch???

A lot of people don't realize that there were two completely different brake light switches used on these cars.
The standard one is a small switch mounted on an adjustable bracket. This one can be identified by its spades coming off at right angles to eachother.
The other is the heavy duty "trailer towing" type. This one is cylindrical, has its spades pointing straight back and has an adjustment nut arraignment on the nose.
Generally speaking, if your car came from the factory with a sway bar, it will have the HD brake switch