Where do I get correct code paint

I have a 1971 Dodge Dart swinger with a 440 that I’m rebuilding with my dad, it’s still its factory y9 gold metallic but needs to be repainted, where do I find this paint and the right one because I heard there are two different types of y9 gold metallic based on the year.

(Edit: is there a website that has gy9 tawny good metallic for sale or somewhere else I can get it)