Grill change question

[gpohl6]

First time post here. If my question has already been answered (and likely it has!) just please direct me to that answer. I have a 71-72 vintage c-10 and really like the earlier style "single bar' grille from the 67-68 vintage truck. I have what I believe is a pair of earlier style fenders with one groove not two around the grille opening (was told they are earlier style fenders). Also, will be replacing the core support, so before I buy or source, I need to also know if I need a particular core support to install the early grille, use the single groove fenders and also, what hood do I need? Thanks for all help! Ready for spring here in Maine!!! Tom