[Dave at Pelican Parts]

We carry RD's products.

You may wind up having to order a left-side floor pan or front half floor pan in order to get that part, though. It might be cheaper to make it yourself or get it from a donor car. Just make sure any used parts you get are in decent shape.

And while you're in there, you might consider reinforcing the area a bit to keep it from flexing when you stand on the brake pedal. Should help firm up the feel.

--DD