That is my mistake! You're right, and now when I double check I see you should be right saying it was modified in 1955. also, I told Carnut about 2 rebuilt cars, while that is also under question for me now. The thing is that information about those races and cars in widely accessible sources is not always true for some reason, and when you start digging you may find out some very unexpected things. All in all, sorry Carnut, it was indeed made in 1955, not 1956. Apologies.
P.S. Where did you find out that 'Pregnant Louse' thing? Never heard of it before