Don't buy anymore of those cheap chinese made brakelight switches. They are guaranteed to fail in short order. Both the seal inside and contacts are substandard. The cheat on everything.
I got a brakelight switch for my '55 from a motorcycle performance shop. It is set up to accept Dot 5 fluid, but I suppose you could still use Dot 3. It's been in there for years now and I get a lot of use out of it. You will need to do wiring terminal modifications to use the motorcycle switch, but it is the right pipe thread size and looks the same as the Dot 3 switch, except for the wiring.