Don't know why but Buick for some reason used Gray for carpet, column, dash & door trim with White Interior. Chevy, Olds , Pontiac all used Black with White Interior.
Used to have people all over me about the Gray when I used to do the show circuit, even when I had all the various books with me.
I personally liked the gray better than black because it was a softed transition in color change than white to black.
Can't wait for spring to finish painting dash and column in gray on the hardtop. Carpet already done.
just my 2cents
AL