I'll take the '68 Burlwood over the '67 any time. As to the factual statement, I don't recall that being an issue. Manual and Auto needs to be accounted for but I don't think there was that significant of a difference sizing wise between '67 and '68.
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