Bulb Socket for different GM vehicles.. Listed here for your reference or needs.. particularly lat 60's - early 70's.
Supplied EACH.. one socket. Order as many as needed.
Three Wire Socket NOT TWO.
Takes the typical two filament Stop/Park bulb as circled.
It is a push in and turn.. three tab socket that pushes in and turns to lock in.
Colours usually.. BROWN, GREEN (or Yellow) & BLACK
Bulb end shown to assist in recognising the socket use - shows bulb base with one upper and one lower staggered pins.