The main rod for the 3190 was originally die-cast (based on the originals in my collection). I believe the only reproductions of this rod were done by Trickel Parts. As far as Trickel Parts go, last I heard (c. 11/2020) David Trickel had Stage IV Cancer and was trying to sell the business. Never heard any more than that.
Good luck in finding parts, as I don't believe anyone is making that part at the present time.
NWL