Take a look at these C2Cfabrication floor pans...

Where did they claim they were an exact stamped replacement for the original?

Ok so you thought there would be... fine. Send them back.

I've built many floor pan repair panels. Spent bukoup bucks on a Pexto shear Chicago brake and a vintage 40 ton iron worker plus the mig welder and hammers/ dollies. No one will ever replicate the factory parts exactly without investing thousands in dies. But a well built replacement piece will work just as good and nobody will be the wiser.

Like I said...send them back. I've done it more than once....