Make the sides..
Flat sheet with one bend approximately 45 degree, and weld a piece of tubing on top for the rolled part. Transfer all holes from an original.

When I get to fully restoring my 1 ton that's my plan.

Otherwise post a wanted add, or keep looking on ebay, Craig's list, and asking around town.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-