Sorry to see this breakage Clemens, I guess you are well within the warranty period.
This
company are very good to deal with and have a variety of fittings. I know nothing of the CX chassis fittings but Woolies will have one to suit if you search around a little. If export is an issue let me know the part number and I'll order it and pop it in the post to you.
Good luck with the fix, I know this has happened in the past to the Classic bodied cars and it was a very gentle drilling out of the remains of the screw with a pin chuck if I recall correctly.
