They seem to have o'plenty of them here: http://www.tradeexcanada.com/index.php?option=com_paxgallery&task=table&gid=9

http://www.tradeexcanada.com/index.php?option=com_paxgallery&task=view&gid=9&iid=2677

From what I can glean the ejector is non-selective and it doesn't matter which tube you ignite, the right and left will eject on the assumption that one will always fire the right tube 1st.

Kind Regards,

Raimey
rse