I do not pictures at the moment but I have tested the NAPA Underhood Black #7242 and Krylon Rust Tough Semi-Flat Black #RTA 9203.
The NAPA paint by far is a closer match to the Firewall. This was the one that has been the most difficult to match. It has a little touch of brown that matches the patina and flat color of the firewall.
The Rust Tough Semi-Flat Black has almost a touch of a purple tint to it and is nowhere near correct. I do not see anything that it matches to the car at all.
