Paint Codes - "Richard Petty Blue"

Hi All,

I'm trying to find out if the "Richard Petty Blue" color was available as an optional "Special Order Paint" on 1972 Plymouth Dusters. I have found references to Chrysler Paint Code "C37D (Special Order Paint)" which I belive was for 1970 Chrysler vehicles, but I can't find it for 72'.

Does anyone happend to know where I can find detailed color code information for 1972 Chrylser/Plymouth vehicles? Was it just the "999" option with the color name?

Here is some of the information I've found on the color so far:
http://www.allpar.com/racing/petty-plymouth-racing.html
http://www.plymouthbulletin.com/guides/1960_to_current.pdf
http://www.mopardealer.com/petty.htm
http://www.mymopar.com/tools.htm

Thanks,