▁ ▁All ▁ 5 0 ▁( used ▁on ▁track ▁on ▁race ▁day ▁and ▁in ▁ 5 0 0 ▁Festival ▁activities ) ▁were ▁essentially ▁hand ▁built . ▁ ▁General ▁Mot ors / Old sm obile ▁contract ed ▁C ars ▁and ▁Con cept s ▁of ▁Bright on , ▁Michigan ▁to ▁build ▁each ▁of ▁these ▁ 5 0 ▁unique ▁cars . ▁Following ▁the ▁race ▁ 5 0 ▁very ▁select ▁Old sm obile ▁deal ers ▁were ▁given ▁the ▁opportunity ▁to ▁purchase ▁one ▁of ▁these ▁cars . ▁ ▁The ▁price ▁was ▁set ▁at ▁full ▁in voice ▁price ▁for ▁a ▁standard ▁International ▁Series ▁cou pe ▁( ~$ 1 4 , 0 0 0 ) ▁plus ▁the ▁cost ▁of ▁the ▁convert ible ▁conversion ▁( an ▁additional ▁$ 1 3 , 9 9 7 ). ▁ ▁Each ▁was ▁highly ▁option ed ▁including ▁the ▁first ▁ever ▁application ▁of ▁He ads ▁Up ▁Display ▁in ▁an ▁American ▁production ▁vehicle ▁developed ▁by ▁Hugh es ▁Electron ics . ▁ ▁After ▁the ▁ 5 0 ▁were ▁claimed , ▁paid ▁for ▁and ▁delivered ▁to ▁the ▁luck y ▁Old s ▁deal ers ▁who ▁said ▁yes , ▁the ▁story ▁of ▁these ▁cars ▁gets ▁more ▁interesting . ▁After ▁the ▁ 5 0 ▁were ▁in ▁the ▁deal ers ’ ▁hands ▁across ▁the ▁country ▁General ▁Mot ors ▁discovered ▁some ▁issue ▁with ▁the ▁cert ification ▁of ▁these ▁one - off ▁models . ▁ ▁Each ▁deal er ▁was ▁asked ▁to ▁return ▁them ▁to ▁G M ▁( where ▁they ▁were ▁to ▁be ▁destroyed ) ▁and ▁receive ▁full ▁credit ▁of ▁their ▁purchase ▁price . ▁ ▁Most ▁of