Not sure where you can get this:
http://www.zefal.com/zefal/produit.php?key=105010
Unless you don't mind paying exorbitant shipping costs for a piece of injection molded plastic that weighs almost nothing:
http://www.xxcycle.com/clips-105002-...105031,,en.php
I have considered using high strength epoxy glue to glue a small conical piece onto a head tube, look at the pump peg on a LHT to see what I am talking about.