I am a tall rider and I would like to find a saddle to gain a little bit of height on my seatpost. I quite like Brooks saddles and as B66 height is 101mm. and B67 is 73 mm., if I would mount a B66 and a B67 on the same seatpost, would it be 28mm higher with B66 or would both configurations result to be the same height overall due to the double (B66) & single (B67) rail clamp?