I rebuilt those support angles with 18 gauge steel sheet. Not that hard to do. I had the originals to make a pattern. The hardest part was forming the step to account for the depression for the transmission cover (picture attached). Also a pic one of them installed with the replacement floor. I left the old ones in place until the replacement floor panel was tacked in to maintain the location of the bend between the floor and toe panel.

I would NOT leave them out.
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Kevin
1951 Chevy 3100 work truck
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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.