▁part ▁of ▁it . ▁In ▁addition ▁to ▁the ▁two - door ▁hard top ▁( H olid ay ▁Coupe ), ▁the ▁C ut lass ▁Supreme ▁series ▁for ▁ 1 9 7 0 ▁also ▁included ▁a ▁four - door ▁hard top ▁( H olid ay ▁Sed an ) ▁and ▁reg ained ▁the ▁convert ible ▁bod yst yle . ▁ ▁Supreme ▁inter iors ▁were ▁more ▁lux ur ious ▁that ▁those ▁of ▁other ▁C ut lass ▁models , ▁with ▁a ▁choice ▁of ▁a ▁Custom ▁Sport ▁not ch back ▁ben ch ▁seat ▁with ▁arm rest ▁in ▁Os bor ne ▁cloth ▁or ▁Mor oc can ▁vin yl ▁or , ▁at ▁no ▁extra ▁cost ▁( on ▁coup es ▁and ▁convert ibles ▁only ), ▁Str ato ▁bucket ▁seats ▁in ▁Mor oc can ▁vin yl . ▁Av ailable ▁at ▁extra ▁cost ▁with ▁the ▁bucket ▁seats ▁was ▁a ▁center ▁console ▁with ▁floor - mount ed ▁sh if ter ▁for ▁which ▁the ▁Tur bo ▁H yd ra - M atic ▁transmission ▁could ▁also ▁be ▁had ▁with ▁the ▁Hur st ▁D ual - G ate ▁sh if ter ▁commonly ▁found ▁in ▁the ▁division ' s ▁mus cle car , ▁the ▁Old sm obile ▁ 4 4 2 . ▁ ▁For ▁ 1 9 7 0 ▁and ▁ 1 9 7 1 , ▁both ▁the ▁C ut lass ▁Supreme ▁cou pe ▁and ▁convert ible ▁were ▁available ▁with ▁the ▁Code ▁Y - 7 9 ▁high ▁performance ▁S X ▁option ▁package . ▁The ▁" S X " ▁option ▁included ▁several ▁versions ▁of ▁the ▁larger ▁ 4 5 5