▁This ▁attract ive ▁red es ign ▁boost ed ▁sales ▁even ▁further . ▁The ▁C ut lass ▁line ▁as ▁a ▁whole ▁was ▁America ' s ▁best - s elling ▁car ▁in ▁ 1 9 7 6 , ▁helping ▁Old sm obile ▁to ▁become ▁the ▁only ▁marque ▁outside ▁of ▁Ford ▁and ▁Che v ro let ▁to ▁break ▁one - mill ion ▁units ▁sold . ▁By ▁ 1 9 7 7 , ▁however , ▁G M ▁had ▁down s ized ▁its ▁full - size ▁models , ▁and ▁the ▁C ut lass ▁Supreme ▁was ▁now ▁nearly ▁identical ▁in ▁size ▁to ▁the ▁red es igned ▁D elta ▁ 8 8 . ▁That ▁situation ▁would ▁last ▁only ▁that ▁one ▁year , ▁as ▁G M ▁planned ▁to ▁down size ▁the ▁Old s ▁C ut lass ▁and ▁other ▁inter medi ates ▁for ▁ 1 9 7 8 . ▁ ▁In ▁addition ▁to ▁the ▁Col onna de ▁hard top ▁cou pe , ▁the ▁C ut lass ▁Supreme ▁was ▁also ▁offered ▁in ▁a ▁four - door ▁Col onna de ▁sedan ▁( with ▁six - window ▁sty ling ▁and ▁fram eless ▁door ▁windows ) ▁as ▁well ▁as ▁six - and - n ine ▁passenger ▁station ▁w ag ons ▁- ▁the ▁w ag ons ▁with ▁the ▁wood gra in ▁exterior ▁trim ▁were ▁market ed ▁under ▁the ▁V ista ▁Cru iser ▁name plate ▁previously ▁used ▁on ▁Old sm obile ' s ▁stretch ed - w heel base ▁station ▁w ag ons ▁with ▁raised ▁roof ▁and ▁sk yl ights ▁from ▁ 1 9 6 4 ▁to ▁