SWAP- Syncros Top Clamp for Syncros Bottom Clamp

[scant]

I've got a Brand New Syncros Top Clamp that I want to swap for the bottom part of a Syncros clamp.

this is the part I have to swap.

I need the lower seatrail cradle as per this pic
http://www.bikepro.com/products/seatpos ... yncros.jpg

anyone?