One of Leo Pruneau's earliest works was made in Detroit with Don Laski in 1962 and became the 1965 Opel Diplomat. This was then worked over to become the Holden HD in Germany. Pruneau came to work in the team that created the Chevrolet Camaro, and whilst on that team in 1964 he was pulled away one lunch time to comment on a British proposal for a Vauxhall Viva HB. The verdict was unanimous that the David Jones design was wrong. Pruneau supposedly sketched a new idea in just three hours, looking very like a scaled down Camaro, and was then asked to pack his bags for Luton and execute his own design which emerged as the Viva HB. This he followed up with the coke-bottle Victor FD before being sent down to Australia in 1969 to tidy up the final design of the Holden HQ. At Holden, Pruneau discovered the Viva HB was being sold there as the Holden Torana HB, and he then developed that into the Torana LC/LX and UC Other projects at Holden were the Holden WB Statesman and the 1978 Holden Commodore VB a cross pollination of an Opel Rekord main section with an Opel senator front and a V8 engine.