where to get replacement wiper switch?

[centuryhouse]

Where can I get a switch that works and (hopefully) wires directly into the original 3-wire plug?

I have the original switch, but it is in pieces and doesn't work or stay together when I try assembling it.

I did confirm the wipers work (on high speed at least) with a simple on/off switch that I rigged, operating off the light blue wire.

When grounding them, one of the other wires (dark blue, I think) causes something in the dash area to make clicking noises, and the other (black i think) does nothing.