First off, thanks!!

As to the grilles, I don't know if I have ever seen two that are the same, and I doubt that there was one specific pattern for the grille strip. I think may have depended on who was in charge of that on that particular day. 

Some of the tractors in the picture are wrong, but it's what I had to work with. The large background Super 88 has the center strip painted red, with yellow letters. To the best of my knowledge, it should be green with yellow letters, like the Super 88 in the third row.

Actually, after looking it over again, the only ones I have questions about other than what I mentioned before, are the middle two 70's in the top row. The left of the two had a hand crank, and the 70 decal was missing. I removed the hand crank, because it would have thrown the proportions off.

On our 60, we didn't paint the grooves red on the radiator cap, because we didn't find any signs of red in those grooves. I have seen original 60's with the grooves painted red,  and I think this was the way the majority was done, but there always seems to be variations.