Unfortunately, the manufacturer part number for the OEM foglight connector is some sort of closely guarded secret. I gave up on trying to find the mating connector that would allow me to plug my new Baja lights directly into the bike's wiring.
I found the Sumitomo MT Series which looks like it should work fine in a wet and dirty environment; these connectors are fully sealed.
I think I'll cut the connectors off the Baja lights and replace them with these. For the bike, I won't cut those but instead tap into them with Posi-Taps to install the Sumitomo mate on the bike.