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@OohCD
DS is right, for 531 you need a 28.6 front mech clamp. After one myself to fit a new Veloce groupset to my Gazelle CM A frame.
Really nice big bikes btw. Are they 64 ctt or ctc? The Dutch manage to make big frames that actually look good. Mine's a 60 ctc but could probably do with being a couple of cms taller.