I paid about the same on rockauto for a passenger floor pan for my 65 Dart. It looked about the same. Took a bit of additional forming w/ a rubber mallet to fit optimal. My first floor pan welding and only ~3rd time welding w/ $99 HF flux-wire. Got 'er done, albiet w/ some burn-thrus.
That site looks like the many "list 'em w/ no value-added" that you see. I read somewhere that the same company is behind many of the similar-looking websites you see for auto parts. Perhaps they have many different names so if you get mad at one you can buy from them again somewhere else. Even Sears is web-selling auto parts, w/ similar vague info, apparently from the same database in the cloud.