Please help me find our old GMC 58 or 59

[bigwavedv1971]

I just signed up for this board- hello to all! I have been hunting for my great Uncle's GMC that was the farm truck forever. When he passed in 1995 it was sold. I have wanted it ever since. It lived in Longmont, Colorado from at least the 70's on up, and was sold there. I believe it had two owners after and then it is unknown. My uncles name was Alvin Koch. It was, I think, a 58 or 59 teal colored LONG bed two wheel drive with white wooden "cattle" racks on the sides of the bed at the time. I can't believe we are missing the VIN number but I cannot find it. Pictures possible but amazingly most of that stuff is gone. I can identify it, if it is still in similar condition. THANK YOU for any info or correspondence!! Dave