The Cooper T43 was in competition from 1957 through 1960. During that time it would be outfitted with Bristol, Climax, and OSCA engines. It was the first Cooper car to score a World Championship win. Sir Stirling Moss was driving Robert Walker's T43 at Buenos Aires in 1958, when the victory was gained. The victory was historic, but with only ten cars on the grid, the race was not as competitive as some other GP events.