Looks to me that the original poster's car is a '67, which predates the spring promotional 1968 color campaign. The door came from one of those cars, but his car is unrelated to that particular door, other than it being installed at some point to replace what must have been a door that was no longer serviceable.
Anyway, I thought this might be an appropriate place to drop the Ford TSB on Fleet Color Codes. Jeff you might want to add this to the library too if it is not already there someplace.