Floorpans - Best Replacement Option?

Here's my floor pan patch in this 90 truck cab that's going onto my 83 D250 the rest was solid as new. Wasn't worth cutting the whole thing out for "that". I'm sure not gonna lose any sleep over knowing that part of my floor pan was once the lid on a 55 gallon drum that brought me ATF at work. And no, I'm obviously not done welding it in at the stage the pic was taken

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