Problem with a used firewall is that it is 1) Galvanized and probably has some rust on it, 2) rivet holes may or may not match up, and 3) be almost as much work as a brand new firewall from Cessna, which is stainless steel. I think the new Cessna firewall is a generic "fits all" firewall that requires cutting out the heater openings and a couple of other holes (someone, Carl, correct me if I'm wrong).
Charles
