1976 Cobra 77X
 

I need to find a mic that'll work on my Cobra 77X. I had a couple of
spares laying around (both Cobras), neither of which worked. Can
someone steer me in the right direction here? I don't feel like playing
hit-or-miss until I finally find one that works. Any info is
appreciated.
Bryan
P.S. I know the radio itself works because I've used it in the past.
But the original mic was lost, and the radio won't operate without it.