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Something like this but due to the odd sizes choose something like a 25.4 to 26.8 to give you the same 1.4mm difference.
http://www.sjscycles.co.uk/humpert-seat-post-shim-254mm-id-prod32253/Unless you can find an exact match.
freezing77
25.8mm carbon seatpost for peanuts for sale on ebay, is possible to shim to 27.2mm safely? any recommendations for a shim?