Help with 67-68 GMC

[Rust Buster]

Run into a little snag converting my 72 Chevy K20 to a 67-68 GMC K20
I have the right fenders, hood, new 67 grille, but what I need is the filler panel that goes between the hood and grille itself. I'm not looking for the piece that attaches on top of the hood. I'm going for a look with no flashy trim, just don't want a gap between the hood and grille like I have now.

Depending on where I go for research, I am told that this trim piece is either called the hood lip molding, top grille bar, or grille filler panel. I also read that it either attaches to the grille or the hood. What exactly do I need and where can I get it? Pics of what I am talking about below. Thanks!