I know a fellow who knows a fellow who searches the country for them. Pretty sad because they throw away anything that can leak like the engine.
At least that's the way it is at the Old Navy store in town.

I got a model of an Old Navy AD for my birthday. I'm in the process of converting it to a flatbed.

1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.