Take an unfaded painted metal part off your tractor, and take it to a Sherwin Williams paint store.
They can match the color for you in their industrial enamel.
You can do the same with NAPA, for an automotive enamel match.
Thanks guys, everything helps. I think I will get some of the Massey, and the Rustoleum, and sparky a bit on the front of the quick attach. Then let somebody who isn’t colorblind tell me which is closest.