Thanks, y'all! I went down that dirt road just to get across the county line eastbound before heading west again to where I spent the night a little ways west of that point (I had first driven the line westbound in 1966 back when I was visiting a school friend during Easter break. and needed to get the line in the opposite direction), and I'm glad I did, the wheatfield was an added unexpected bonus.
And I loved eating in that Diner, I'd gladly go back to eat again, this time to have the chicken-fried steak. And yes, it resembles a certain other Diner to be sure!