I have a set of NOS '67 grills I bought in 1998. The centers are black and the outers are charcoal.
AND the center (larger) horizontal rib which gets covered by the 400 "hockey stick"...
is painted silver.
These sound like '68, not '67.
Sorry to hear they may not be the parts you thought. I will gladly take them off your hands!
1968 400 Coupe, verdoro green, black vinyl top, auto 1969 GTO Judge coupe, Carousel Red, manual 1971 Trans Am, cameo white, auto 1970 Buick Skylark Custom Convertible 350-4(driver), Fire Red, white top, auto 1972 Buick GS Stage 1, Royal Blue, black vinyl top, auto