Farpoint Metric universal dovetail bar to fit the metric sized telescope rings.
http://www.bintel.com.au/Accessories...oductview.aspx
The hole pattern has a 60mm wide spacing at several intervals to fit the William Optics style rings and the many asian made clones.
This bar is 254mm in length ( 10").
Hardly used.
Cost is $79 new. Asking price $50 (plus postage)