Rustoleum "textured" black is a perfect match.

There is some debate about the coarseness of the original texture. Some were more "satin" than textured. I sprayed some pieces and compared them to others with the original finish and the Rustoleum is a perfect match. However, I strongly suggest a flat or satin base coat so you can spray the "texture" to whatever degree you deem necessary without seeing bare metal or primer beneath it.