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danb
http://www.ebay.co.uk/itm/Hylix-Carbon-Seatpost-27-2-30-9-31-6-34-9-400MM-152g-Ultra-Light-RD-For-7-9-Rail-/291665694090?var=&hash=item43e8a14d8a:m:myp0amh4I996xMsiWq8SUww
Is this the seatpost you have on your Planet X? I think I have the same saddle its got oval rails so a bit specific on which seatpost fits...