who is the manufacturer? Thule, Atera ? Maybe they have it as a spare part.
http://www.atera.de/de/30_Produkte/10_P ... raeger.php
http://www.thule.com/en/Language%20Selector.aspx
http://www.atera.de/de/30_Produkte/10_P ... raeger.php
http://www.thule.com/en/Language%20Selector.aspx