There has been a fair bit of research into the correct colours,but seeing as there really has been no records of colours kept,and colours were changed from model to model.I have read somewhere that the best hammertone colour match has come from a white king spray can.What most people (myself included) have done is just found a colour that they liked and what they think is close and use that.Unfortunately for me I can't get them in hammertone.I just don't want to use spray cans.