If you (he) can get a photo of the back of that switch and maybe see who the manufacture is, Also the contact configuration, i.e. (OFF-ON-ON)
Might not be able to match it perfectly (color, handle)
I tried "wiper control toggle switch" and that turned up some interesting prospects.
2001 Coachmen Mirada (Ford F53 6.8L V10) - Toad 2003 Saturn Vue.
It won't do MACH 2, but I can get a sandwich and take a pee.