That goes on a '49 IH hay binder, or a Hoyt-Clagwell tractor, or maybe a Defective tractor (they are similar to the Hoyt-Clagwell, but had the 3 point hitch).
I have no idea what that part actually goes to. I'm just spit balling.
Are you sure that it came off your truck?

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission