Tim,
I also have a 49 1/2 ton and the hole on the end of my clutch pedal is the same as yours. There is a large round on both sides of the hole all the way around. It appears very smooth so I assume it was probably made like that. My linkage rod is 5/16" as you said and the hole in the pedal measures roughly 0.420" with calipers (with a coat of paint in there). The hole looks very round so I assume it is probably factory as well. My clutch linkage rod does fit in the pedal very sloppily which I'm sure is probably why you are asking. The spring should take all the slop out and hold it against the toeboard.
Last edited by 1866yellowboy; 06/24/2016 4:21 AM.