I had to repair the grill on my 71 cuda. A minor fender bender had broke off a corner and had split the grill right down the center. I used SEM 39768 -- called problem plastic repair material. It is a two part epoxy that was easy to sand also. I don't know what the difference is between the SEM products # are--39767 or 39768 ect. but my grill turned out great.
