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9000 works on some classic builds, but not all. Have done similar on my Vitus 979 and it seems to work with the aluminum frame accents. Not really sure it would work on this build, 9100 with the carbon Look post and a black ergostem would make the frame pop out more.
I also found a 7400 front derailleur, cleaning out the parts bin over the holidays. You can have it if you cover postage from Belgium.
9000>9100 for classic bikes