[Chevelle-list] '68 Grille fitment

[Bill Lessenberry]

Had the bumpers done by Tri-City Plating and they look like 
mirrors.  Made my old original grille look kinda tacky 
(scratches,dull, etc), so I bought a NOS grille off of 
Ebarf.  Painted the black in the middle and installed it with the 
little rivets with the nuts on the end.  Started installing the 
grille extensions and now I got a problem.  The right side has about 
a 1/4" gap between the end of the grille and the extension, I can't 
install the left side extension 'cause it's butting into the grille; 
so the whole grille needs to move about 3/16" to the right.   The 
holes that the grille rivets are in don't have any play to adjust the 
grille side-to-side, and it doesn't look like the grille support 
brackets are adjustable either (kinda hard to see for sure).  How the 
heck do I remedy this??  All ideas welcome, good ones are deeply appreciated.
BillL