INOS Mopar 1633761 transmission cluster gear. There is some minor chipping as you see on the edge of a few teeth on the second set. I believe this superseded to 1738216. Listed to fit:
Late 1955 Plymouth
56 DS Firedome
56 Chrysler Windsor
59-60 Chrysler 6 cyl w/o overdrive.
Tooth counts from top to bottom (I think the top is reverse) 14, 18, 23, 31.