the grill supports are different for a 68 and a 69 chevelle. a 68 grill is riveted to the supports. i also think that the bolt holes on the center support may be different on a 69 but i'm not sure. i do know that the 8 and 9 center support are visually different.
I had a changeover myself and yes everything can be changed over easy except the side markers. The grill can be installed, with a little jury riggin. Trust me on that. The side marker holes will need some cutting, but you can make it work
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