I'm surprised you can't find a modern replacement drag link and or the ends and a sleeve to make one? Or at least find best you can and ream the pitman arm and steering bell crank to match the tapers of the drag link ends you can get.

If looking up part numbers is a dead end start looking by dimensions.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-