Hi, I'm selling a brand new Artemis Act2 Docking Bracket for 1.8" post but can work with 1.5' post if you get the proper collar for your post. here is the product page:
http://shop.artemis-hd.com/index.php?cl=details&anid=4c0d0218a61e3213397e36e0b2438da1&cnid=6475e71c69824f5aa586f7805d74fb5e
I'm selling it for $900 + Shipping. Let me know if interested.
Best, Sébastien.