I think the top piece is more like 16 gauge. You can buy them separately. Link If you want to fabricate your own, I could measure the thickness of mine for you. But for $12, just buy one.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.