A hydraulic brake light switch is a simple on/off switch that is plumbed into the steel brake lines. There is no polarity. Almost all have 1/8 NPT threads. The big difference is in the prongs/contacts. Some take clips, some take ring terminals, some take female bayonet connections, and some (I shake my head in dispair) have mixed connections. Fords used this type of switch for several decades and their switch used .177 bayonet connections. Your wiring is bad anyway. Use a Ford switch and repair the wiring as necessary.