I had this in The Paper Trail and got no responses, but maybe it will do better here... What is correct for a 68? Year One catalog says 67 lt blue, drivers' door only. 68 dark blue, driver's door only. Jim Osborne's catalog has only one color blue, both years My buddy has found three original 67s in the junkyard with light blue stickers in both doors. He has not found a sticker on any of three 68s.
I don't have any proof but from what I have read the light blue (teal color) is for '67 and the darker blue is for '68. I have owned two '68 GS's and neither had a sticker.