I think 7 sizes (versions A,B,C,D,E,F and K) although the K version only flew once (V196)
You might have seen in our last tweets that Ariane 5 uses 6 different sizes for its SYLDA system, learn more tonight! 
#TechThursday #Ariane6pic.twitter.com/y7xkTCXUsZ
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I have to check with our engineers but this solo flight might be the reason why we had the number 6
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Very very cool!
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Thank you David!
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Thanks for the love Stefan!
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