Matt,
GM #
6256801 - 60-64 Corvair 3 speed Back-up Light Switch
GM #
3937155 - 69 Full Size (W/O A/C) Heater Switch (Might fit other cars and years as well.)
Gm #
3868842 - Group 1.745 - 66 Chevelle w/hi perf, Sp hi perf (396), 67 Chevelle and Camaro w/closed pos vent (396), 65-73 Corvette - Connector, vent to air cleaner. (Might fit other cars and years as well.)
Ed