Table:
text: Roy Salvadori
Complete World Championship Formula One results
Complete World Championship Formula One results
Year_ Entrant Chassis Engine Pts_
1952 G. Caprara Ferrari 500 Ferrari I4 0
1953 Connaught Engineering Connaught Type A Lea-Francis I4 0
1954 Gilby Engineering Ltd. Maserati 250F Maserati I6 0
1955 Gilby Engineering Ltd. Maserati 250F Maserati I6 0
1956 Gilby Engineering Ltd. Maserati 250F Maserati I6 0
1957 Owen Racing Organisation BRM P25 BRM I4 2
1957 Vandervell Products Ltd. Vanwall Vanwall I4 2
1957 Cooper Car Company Cooper T43 Climax I4 2
1958 Cooper Car Company Cooper T45 Climax I4 15
1959 High Efficiency Motors Cooper T45 Climax I4 0
1959 David Brown Corporation Aston Martin DBR4/250 Aston Martin I6 0

Question: Who is the competitor with a pre 1958 Cooper t43 chassis in Roy Salvadori?