I am under the impression that my seats had 2 and 2 holes.
I will take them out these days and check it.
By the way, the small screws that get screwed are a set with number 10 ->
http://bmwfans.info/parts/catalog/E4...eat_seat_rail/
Check the cost, I asked the dealer and freaked out !
Ridiculous ! 2 plastic things and 2 screws 700 CHF !!!