Cmjcamp13

I need help. I have am looking for a part. I can not find a part number anywhere and the dealer says it comes as one unit when you purchase a complete strut with airbag. On the front struts there is a flange near the top that the flange on the lower side of the airbag meets up too. There is a plastic ring that holds the two flanges together and kind of clips together. Mine has broke in half and there is no part number on the half that I have. Has anyone else had this issue