Looking for a replacement seat post for my 2010 Cervelo S3. I was taking my bike apart tonight to do an overhaul, and noticed that the rear edge of the seat post has been slightly compressed/crushed (but no fibers showing, just mis-shaped) at the point where it clamps into the frame… 
I have a seatpost from a 2009 SLC-SL. I’m will to sell it if it fits your bike.