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Question on replacing pickups on a Jazz Bass

I just purchased the Fender Custom 60s pickup set and I'm trying to replace my pickups. I can figure out the wiring fine except for the little plates that the pickups sit on also have a wire soldered to them. One plate has a long metal stem (about 3 inches) coming from the center of the plate.
My questions are:
What do you solder the wires to?