[JohnC]

Originally Posted by GCncsuHD

..... the newer hoods. 2003 and 2004 there was absolutely no difference between HD and non HD hoods and grilles. The only difference was the taller bumper cap on the HDs to overcome the 2" body raise.

2005 The HD got the taller HD grille, and a different grille.. While the hood will fit onto 03-05 non HDs it will not fit the grille properly, although the HD grille can also be swapped to make it work.

In 06 and 07 the half tons also got the same grille and hood as the 05 HD.

Yep this is why.