[ToughBowtieTruck]

Yep. They can bolt up. 79 does have a different front clip arrangement, as the chrome headlight bezels also surround the turn signals and run along the lower portion of the front valance. The grill may be different, if you have a 73-74 style grille they will not interchange unless you use the other mounts and the center core support bracket, as the 73-74 grille is recessed into the core support deeper. 75 might have amber turn signal lenses also, but that is a quick swap if looking for originality. Other than those main things, should bolt on without any other differences.