This is the one I use and is the same as the one in your pic:
http://www.myastroshop.com.au/produc...sp?id=MAS-030M $479 at MyAstroShop
and Pier mount, heavy duty, for EQ6 and EQ6PRO equatorial mounts. $349.00 at Andrews Communications
http://www.andrewscom.com.au/site-section-10.htm in Skywatcher Accessories