Nictrix said:By the looks of it and from what members have said in the past it may require the bumper to be removed as they are clipped in place.
Maybe they can be done in place if the wheel arch liner is removed.
https://www.realoem.com/bmw/enUS/showparts?id=LM13-USA-04-2012-E89-BMW-Z4_35is&diagId=51_7325