Its really that hard to swap grills from a later model to a 73-74 style. You just need to remove the center support from a 73, it all unbolts very easy, as long as the two side mounts behind the headlight covers, two bolts might have to remove. Remove the entire grill/bezel assembly off of your, minus the bottom and top peices. Swap center supports, remove the two supports on each side of the center support, there will be two indents near the headlight where you can match/drill for the side brackes. Install new brackts, install grill, bezels and then you have a 73-74 front end on a 75-79 truck.