▁D yna flow ▁was ▁now ▁standard ▁on ▁all ▁Sup ers , ▁along ▁with ▁fo am ▁seat ▁c ush ions , ▁a ▁tr unk ▁light , ▁electric ▁clock , ▁direction al ▁signals , ▁front ▁and ▁rear ▁arm rest s , ▁sl iding ▁sun sh ades , ▁cig aret te ▁l ighter , ▁glo ve ▁compart ment ▁light , ▁map ▁light , ▁dual ▁horn s , ▁Step - On ▁par king ▁bra ke , ▁Red ▁Lin er ▁speed ometer ▁and ▁trip ▁mile age ▁indicator . ▁A ▁new ▁body ▁style ▁was ▁the ▁ 4 - door ▁Riv iera ▁hard top . ▁ ▁Sales ▁of ▁the ▁Super ▁fell ▁to ▁ 8 0 , 9 9 8 . ▁▁ 1 9 5 7 – 1 9 5 8 ▁ ▁The ▁Super ▁used ▁the ▁new ▁General ▁Mot ors ▁C - body ▁for ▁ 1 9 5 7 . ▁Lar ger ▁than ▁the ▁Series ▁ 4 0 ▁Special ▁and ▁Series ▁ 6 0 ▁Century ▁B - body , ▁the ▁Riv iera ▁body ▁styles ▁had ▁different ▁roof ▁treat ments ▁as ▁well . ▁Sup ers ▁had ▁a ▁group ▁of ▁three ▁Che v rons ▁on ▁each ▁rear ▁quarter ▁or ▁door ▁for ▁series ▁identification , ▁in ▁addition ▁to ▁the ▁normal ▁word ing ▁within ▁the ▁gr ille ▁and ▁deck ▁em blem s . ▁Four ▁V enti Port s ▁were ▁used ▁on ▁each ▁front ▁f ender . ▁Cl osed ▁models ▁were ▁u ph ol ster ed ▁in ▁N yl on / C ord ave en ▁combinations ▁while ▁the ▁convert ible ▁had ▁an ▁all - C ord