It's A W-I-i-i-i-de Track Pontiac

It seemed like upper GM management was losing faith in Harley Earl's designs. While the 1959 Pontiac was due for a remake, they sent Earl  to work in the UK (Vauxhall) and Germany (Opel) while Bill Mitchell's team worked on the '59 design. When he got back, the GM president and division managers told Earl they favored Mitchell's ideas. Well, Earl retired, replaced by Mitchell, and as a final "Goodbye", in his retirement contract, it was stipulated that he would have no input into any of GM's future designs. For 1959, along with the novel, and soon to be iconic split grill, they went with the "Wide Track" design which made the Pontiacs distinctive look over GM's other full size cars. The main reason, despite the claims of better handling, was that GM order that a single body would be used for all GM cars. Previously there were 3 different bodies each year: the A body for Chevy, the B body Pontiac, Olds and Buick, and the C body for Cadillac. This Bonneville with its distinctive look and powered by a new 300 HP 389 V8, helped the Pontiac line up to sell 383,320 cars that year which was a whopping 75% increase over the previous year.