Hey Doug
Are you talking about the fender extensions on top of the fenders that go on each side of the upper grill?
I have a GMC also its a 45 with a painted grill. Ive had the same question for sometime about the extensions. ive come to the conclusion, that the they are supposed to be cab color.
My truck was brewster Green with Black fenders & running boards.
If you peel back the weatherstrip on the extensions there is shiny green paint underneath. Also the peice between the 2 grilles, "I call a mustash " because it looks like one, should also be cabcolor, on both sides.
