Keegan -
The pre-fabbed hat section should be available, in 2-3 widths (IIRC), from just about any auto parts store that sells paint and supplies to local body shops.
As for that seat brace, I don't know the gauge of metal, but it looks much simpler - like something that could be fabbed with a bead roller. Eastwood offers some that can be clamped in a shop vise:
http://www.eastwood.com/metal-fabrication/bead-roller.html Surely one of the resto shops in your area will have such a tool or can direct you to another shop that does. With the right tool and experience, and what's left of your original and some critical measurements, I bet they could knock one out in minutes - much quicker than you scratch-building a substitute.
BWT, if you're gonna be doing similar work to the right-hand floor, don't make the mistake of assuming that RH mirrors LH. As muh as we'd like to think they do, it ain't necessarily so.
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