Yep. Got my z4 last week and the coup holders squeaked like mad and was doing me in!
Took them out, easy with two screws (only a likle bit fidley to get cover off one screw) and found that the outer part was squeaking against the inside part.....just took a tube of glue and dabbed many points where the two meet and job was done.
No squeaks from here now....just the other 50 to sort in the car!