Need more information. If they are oe BMW crossbars...then we need the 11 digit BMW part nbr.
An image alone without any measurements isn't enough. There are multiple cross members for multiple BMW models that have roof rails...and they all have different widths. So again, without any details or info...an image alone is not worth guessing.
They could be for any of the generations of BMW 3 series Tourings, 5 series Tourings, X3, or X5...again, without any other indication as to what they were previously used on, or the BMW part nbr (which will absolutely identify which BMW models they fit)...it all a pig-in-a-poke.
You can also look up the BMW part nbr for the e53 cross members...then run it through the part nbr cross reference on any of the online part databases (like realoem or bmwfans.info) and see if the e53 cross members can be used on other BMW models...if so, then you can search for any of those cross member. If not, then you'll know that only racks for the e53 will work.
RealOEM.com * Diagram Selection
(this is what the earlier cross members looked like for the e53 (as well as other models mentioned above)
BMW Part #
82 71 0 399 453 or
82 71 0 005 998
(BMW then changed the design to look like the cross members below...but again, there's different part nbrs based on which BMW model you have to accommodate the different widths)
BMW Part #
82 71 0 415 053
