I'm in the same boat as you. Repop ones are crazy expensive, Non rusted or beat up originals are non existant. I've thought abot having some sheet metal bead rolled and reskinning the top.

Here's a cool link of some custom ones.

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1954 3600 Chevy Truck
"The Fake Truck"
In the Stovebolt Gallery
More pix on Photobucket