Correct paint color for a 1970 Dart 8 3/4 axle assembly

I have wondered why people can spend so much time trying to determine the exact amount of flattener in black for like this rear end, to make it exactly like came from Mother Mopar, and then shoot the body with b/cc!!!!!! and wet sand an buff that to an inch of it life!??? lol..:rofl::poke::poke: Get my point!??:poke: