There is a numbering CD 342 on the part that is broken and it is wheel assembly I am sending a vid of this part this is L shaped part that slids in to arm of frame to connect one side with another arm
Paul from SWISCO responded:
July 8, 2014
This looks a lot like a combination of our 95-227 corner and 84-096 roller. These parts are also very popular in Canada. Look them over and see what you think.