i totally agree with luis
it is not the right place to buy anything, excepttion made of cars, and memorabilia, or accesories
there is not evenually none bmw vendor, you may find 20 mercedes specialist and not even one for bmw
i was there last year, and i wil never be back
you might find even a bosch specialist, that has not your parts needs, so he will offer you a website address and tells you to contact him after the exhibition days !
loosing time and money, IMHO
it is much better to check for visiting scrapyards around !
anyway luis, enjoy your stay