[NevadaDVX]

Can someone tell me what bulb number goes into the cargo lamp on a 71? Mine does not have a bulb in it and the connection is a two prong deal. I was wondering because something like an 1157 would have two prongs and two filaments. Of course a cargo lamp would only need one filament. I am wiring this up for a 3rd brake light and not sure which bulb to use or how to ground it. Thanks for any help.