Kammala wannan jumla: Mickey Thompson hayar MacDonald su fitar da daya daga cikin m low profile baya-engine tseren motoci a cikin
1964 Indy 500. Thompson ta Ford-powered racers aka musamman tsara don gudu a kan 12 "tire da kuma sanya su halarta a karon farko a cikin 1963 Indy 500 karkashin Chevrolet ikon. Motocin sun zama sanannun "roller skates". Sun riga sun wuce lokacin su, amma ba a tsara su da kyau ba kuma yana da wuya a tuƙa su. Graham Hill ya gwada motar kafin tseren Indy na '63 kuma ya ƙi tuka shi saboda rashin kulawarsa, yanayin da ya zama mafi muni ga 1964 lokacin da aka tilasta Thompson ya sake tsara motocin gaba ɗaya don saukar da sabon madaidaicin madaurin taya na USAC.