If you don't have the end parts for the rail, yes you will need a new cross bar. I've priced them and frankly, the BMW rails are the better deal.What is the Roof Rail for? I need to put a ski rack, does it I mean need to buy another Roof Rack Cross Bar?
+1, but make sure how a box may fit through your garage door or other parking structure.You will need cross bars. If i were you instead of ski rack I would buy cargo box from Thule or Yakima. Your skis will be clean and you will be able to use it for other things if desired.