Can you set your wheels straight ahead, check that you have no or little toe in, and measure what you need on your truck?
Probably hole to hole in the steering arms and then account for whatever rod ends you use.

•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-