https://www.realoem.com/bmw/enUS/showparts?id=5L31-EUR-02-2015-F11N-BMW-520d&diagId=34_2129
Its the Performance Power Kit - Reinforce breaks - you can simple swap. I don't see any stability issues and i have it, as they are for any 520D with or without Power Kit
If you upgrade your car with PPK you get it inside - Best Upgrade you can make if you need to exchange disks and pads at the same time!
https://www.realoem.com/bmw/enUS/showparts?id=5L31-EUR-02-2015-F11N-BMW-520d&diagId=03_1120