What??? 62/66 GMC grille swap - doesn't fit???

[GMCMG]

I hope this hasn't already been discussed, and most likely I am just figuring out something everyone else already knows.
I am swapping the grille off my 62 GMC (chrome) for another GMC grille I have laying around. I think it was from a 66 based on the letters, but I bought it with a bunch of stuff that was a mix of Chevy/GMC and probably varying years.
Just so it wouldn't look like crap, I shot a quick coat of paint on it (that really brought out the dents), and was all ready to bolt it on when I discovered that none of the holes line up. The mounting brackets on the back of the grilles are apparently different between years? News to me...
Recommendations? I am pulling the chrome grille to protect it, as the 62 is more of a worker bee, and the 64 will be the queen (one day many years from now). The chrome grille isn't perfect, but it's a darn good driver.
Can anyone offer any suggestions? I have these options: a painted grille from the 64 (assuming it bolts up); a grille from a 66 Chevy (probably the same issue as this one); drill new mounting holes; cry and put the chrome grille back on. Also, as my 64 is in pieces so I cannot check, will the chrome grille bolt right up to it?
Anyone got any good ideas/info?