Yup, they are extra and no longer needed unless you:
-are going to sell the X5 and think you want to pull the hitch off and sell it seperatly to make a few extra bucks. (probably not worth the effort)
-are like me and hate throwing usuable car parts away so trip over them for three months before getting around to stash them somewhere .
-Find someone who's X5 was rear ended and needs to buy bumper parts.