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https://www.bike24.com/p257708.html
this one may be longer, although I don't know the diameter you need.
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Thanks @Sumo but it is the 'teardrop' shape I am after, not the 'round' ones that come in different diametres.
I will measure and probably ask frame sellers on AliExpress...
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I think this would work, however I don' want to smash £90 on it:
http://www.jejamescycles.co.uk/giant-tcr-seat-mast-id57755.html
I will pop in Condor and see if they can source a Deda 'teardrop' long ISP clamp.
The ISP is about 1cm too short for me so I had to fit a saddle with an additional 1cm of profile.
(I had a stripped Aspide that looks sweet)
I had a quick look online to find an ISP with more adjsutment options but I have not found one yet.