Found this guy on Youtube I used to watch, Crazy some of the stuff he did But he Surely knew what he was talking about... Looked up that Dozer he had IH TD-20 Dozer. https://www.youtube.com/watch?v=-RGiptFLKSg
Didn't find much... Tractor data didn't show much but tractors.fandom did... apparently, 2,963 units built from 58-61 That was before my Time, I grew up on Old Michigans / Clarks, Terex's, IH, etc being a Concrete/Construction family.
P.s are there any old Heavy Equipment shows in Michigan, Indiana, Ohio?