Jim,
You could try CARS Inc, they are in New Jersey and have a lot of NOS parts. I have purchased some items for my 56 Buicks from them before.
If I had to take a shot in the dark I would guess that Olds and Pontiac also might share the same switch.
_________________________
Scott T.
29 Larrabee 2 ton truck
36 Ford 1.5 Ton dump
46 Dodge 1.5 Ton WF-32 truck
50 Chrysler Windsor
66 Tempest 2dr post
67 Cutlass 2dr post
56 Roadmaster Riv. Hdtp
56 RM conv. bad shape
83 Regal 2dr w 430 v-8
88 Lincoln LSC