Here's a thread on it. The one I use is from NAPA and it is a few posts down on page 1 with a pic included.
http://www.can-amforum.com/forums/can-am-brp/38099-spanner-socket-trailing-arms-canadian-store.html
http://www.can-amforum.com/forums/can-am-brp/38099-spanner-socket-trailing-arms-canadian-store.html