Need help with 66 Dart paint code.

My 1966 Dart paint code reads..WD2 D.I know the the D is for medium blue and the W is for white,but what is the 2 and the extra D for?Thanks for any help.


P.S I,m thinking about re-painting the 66 Dart and would like to hear opinions on color choices.Any help would be appreaciated.Thanks
View attachment Racing the 66 Dart 071.jpg