The service is exclusively engaged in BMW, they do not know that the brake discs are lightweight and interchangeable with solid cast iron ones. The girl who picks up spare parts does not understand her job at all, does not know and does not understand what interchangeable spare parts numbers are. The master did not measure the disks and says that they are different, how is it in general?
Install a good paid bmw program.
I do not advise anyone, ordinary garage workers think better than the so-called specialists of this service.