Coupes had either the base interior - 1-color panels, Reed grain center - or the Decor Group (Satellite) 2-tone panels, square quilts in the center. Decor panels were the same colors whether coupe or HT. All '68 HTs were Decor Group cars.
I've seen base-interior panels with 2 colors, but they're not correct according to original cars I've seen in 3 different colors, including my silver ones.