rest s ▁were ▁made ▁standard ▁equipment ▁due ▁to ▁federal ▁safety ▁mand ate ▁and ▁the ▁ign ition ▁switch ▁moved ▁from ▁the ▁instrument ▁panel ▁to ▁the ▁ste ering ▁column , ▁which ▁also ▁was ▁designed ▁to ▁lock ▁the ▁ste ering ▁wheel . ▁This ▁ign ition / ste ering ▁wheel ▁inter lock , ▁found ▁on ▁all ▁ 1 9 6 9 - model ▁General ▁Mot ors ▁passenger ▁cars , ▁except ▁for ▁the ▁Cor v air , ▁deb uted ▁one ▁year ▁before ▁the ▁federal ▁government ▁mand ated ▁it ▁on ▁all ▁ 1 9 7 0 ▁models . ▁ ▁For ▁ 1 9 7 0 , ▁the ▁C ut lass ▁Supreme ▁name plate ▁was ▁switched ▁to ▁Old sm obile ' s ▁equivalent ▁of ▁the ▁down s ized ▁Pont iac ▁Grand ▁Prix ▁on ▁the ▁A - body , ▁to ▁give ▁the ▁division ▁an ▁entry ▁in ▁the ▁bur geon ing ▁market ▁for ▁smaller ▁personal ▁lux ury ▁cars . ▁As ▁such , ▁the ▁two - door ▁hard top ▁had ▁a ▁new ▁not ch back ▁roof line , ▁while ▁lower ▁trim - line ▁C ut lass ▁coup es ▁had ▁a ▁fast back ▁style ▁roof . ▁The ▁model ▁remained ▁in ▁this ▁role ▁for ▁virt ually ▁all ▁of ▁its ▁production ▁life . ▁Un like ▁the ▁Grand ▁Prix ▁and ▁the ▁also - related ▁Che v ro let ▁Monte ▁Carlo , ▁which ▁had ▁wh olly ▁separate ▁bodies ▁and ▁names ▁from ▁their ▁less ▁expensive ▁sib lings , ▁the ▁Supreme ▁shared ▁front ▁and ▁rear ▁body ▁parts ▁with ▁the ▁standard ▁C ut lass ▁line ▁and ▁was ▁always ▁market ed ▁as