I have explained that the races in Europe you refer to are 550-07 without its buckle byt retaining its fixed rear. It was not "reconfigured" as 550-05 but was 550-07 throughout and became Bousquet's car.
How can you explain the photo of the fixed back car taken at the latest March 1954 in France when 550-07 has the lift back at the same time? It would take weeks, if not months to rebody it.
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