Glove box switch with light

The only online search result for your part number comes back to this thread. 2947924 is shown in the '78-'81 truck catalog for B-vans.

The part number you probably need is what's printed on the side: 4221237. It looks like it was used until the end of B-van production in 2003, but I don't have a first year. All my muscle-era stuff has a built-in power lead and no ground lug, including 2947924, which is (also) the E-body glove-box lamp. If your dash structure is metal, that should work... but you'll be outbidding the Cuda/Challenger crowd if one comes up on eBay--the last one I found brought $100 Canuck. If the area where it anchors is plastic, then you need the 4221237 for the ground lug.