That's just payback for all those Buicks runnin' around with Chevy stripes on their hoods and trunks.
I will never understand all that excitement about those small A-body GM cars with a stupid spoiler and stickers....
Yes... Very rare car..... they flew the Concourse badge..... Im not talking about Nova bodies just the chevelles..... Fremont assembly IIRC.
I believe they ran out of Chevelle interiors and had to use the nicer Buick interiors to keep the line rolling.
The seats are 68 Buick without the buttons but the door panels are not on that car. The few Chevelles I have seen pictures of with Buick interiors had Buick door panels also. At least the Chevelle in the OP has the correct one year only colored door lock knob pulls. Not a fan of the GSX treatment, not a fan of the SS treatment on Buicks either.