Patch panels.

toolmanmike said

I got some external panels from Laysons that fit nicely. They probably have floor pans too. I just looked it up. It looks like Classic Industries has some as well. Dodge All Models Parts | Floor Pan | Classic Industries

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Early A's are different and not available from Classic as far as I know. ABS is the only one I know of that has decent quality floor pans for the '66 and older A's. Even theirs need to be messaged a bit, but, they fit pretty good.