anyone know how much the dealer charges for this? I tried calling my 2 local dealers and 1 didn't pick up (on 2 occasions) and the other was just a secretary type who wasn't sure what road force even was. It must be road force btw.

I have an independent place asking $30/wheel and if the dealer is almost the same I'd rather them do it.

Is it crazy just to get the 2 rears done if the vibration is in the seats and not in the steering wheel?

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr