I have a frame which originally had the single, center rear cab mount (year unknown). I mounted an early '49 cab which came equipped with the two rear shackle mounts on it. I have an extra '52 frame which I used to take measurements for the shackle holes and drilled the holes in the older frame. (If I was Denny G, I would have made a template, taken many pictures and saved them on my hard drive, but I am no D.G.) I would not use the center mount on a '50 cab, as it lacks the center, inner-cab reinforcement structure (the one which prevents you from using the behind-the-seat gas tank).
Carl
Last edited by 52Carl; 07/29/2014 3:55 AM.