Im sure you can make it work, I have a 79 round headlight truck i put an nos grill in couple years ago, i had plans to convert to the 76 grill just because i like that grill better. If i remember right the back of the headlight mounts are really close to the core support already, but you could cut some big round holes behind the headlights so you have more room. I gave up on the idea because i found the nos grill for a good price. Honestly i always thought the 79 grill would look better if the headlights were sunk further back in it also! They just seem to really pop out there, I put a set of flat hella headlights in mine and it made a huge difference in the look. Would still like to sink them back another half inch or so but there isnt much room behind the headlights.