Catalinas and other 1959 Pontiacs were completely restyled on a new General Motors B-body that was shared by all GM divisions from Chevrolet to Cadillac, replacing the previous A-body utilized for Pontiacs and Chevrolets that was used only for 1958. Twin tailfins, two on each side, were new and only in 1959. Styling highlights include thin-pillar rooflines and greater use of glass for increased visibility. Pillared four-door sedans feature six-window styling, while two-door hardtops were dubbed "bubbletops" due to the large wraparound bubble windshield and thin c-pillar and large rear window; four-door hardtops featured flat-blade rooflines with an overhang past the rear window. Wheelbases were 122" for Catalina and 124" for StarChief and Bonneville  inches, but overall length on Catalina was 7" shorter than Bonneville and StarChief at .