If your referring to the hood latch that is connected to the grill support the original finish is phosphate & oil
Have no idea of the date code since you didn't post when your car was really built
As for part number - of you purchase a NOS one its will most likely not have a date code that would be correct for your car.
C9ZZ-16700-A
Remember no engineerign or part number will be on the part. Plenty of good used ones out there that just need replating and greased