According to Jess Pourret's book 'The Ferrari Legend - 250GTO Competition' book, Stirling Moss was entered with a co-driver who's surname was Solomon in Rob Walker's Ferrari 250GT SWB, chassis number 2735GT.
It states Entry no 152 (Stirling Moss/Solomon) DNS (did not start).
Does anyone know why he did not start this event? It seems strange that the organisers had not only issued a race number and also knew what the car/chassis number was.