I've been along that route a few times, all the way down the line to the early 1960s, but hit the buffers and still no luck. Of course I may have missed something on the map as the grab handle type part is still not found, as far as I know.
The overhead handles in the 1977 Falcon pit are these things. There are a couple of others in the Falcon, one on top of the cannon and one in the top corner of the cargohold above the Navcom desk.
Other ideas include a small chainsaw grip (gardening or medical bonesaw), or something like a manual carburetor lever (if that's even a thing lol). The handle has a folded P-clip attached - and the props department stuck a small blue button or panel light lens on the clip. Something like that.