I'm in a similar situation. I ordered the bilstein B12 kit (Bilstein 46-189523), which are the sport B8 version with matched eibach springs. I opted to go this route for better spring rate compliance with the valving and only a 30mm drop.

Here's the kicker.... I ordered them back in May. They were back ordered till Oct, now they are pushed out till Mid December! Whats going on over at Bilstein? Holy crap!

I have a set KW's, but I have opted to simplify things and will be passing those on soon. I mounted the rear springs to do a test, and the drop was lower than what I wanted. Soo.... I'm waiting like you.

Anyone here have the B12 kit? Any feedback? Thanks in advance.

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2005 X5 3.0, 6MT, Alpine White on Truffle Brown, Sport, Preim, and Cold Weather, Alpina Stainless Headers, AFe Intake, UUC SSK, OEM 87's, 3.64 Differential Swap,Performance Modified Euro 2 Tune, UUC LTW Flywheel and HD clutch, Bilstein B12 Suspension kit
Future mods ZHP/Schrick Cam Shaft upgrade, Operation code name:Doppelschrauben-Kompressor

Wife's Ride: 2011 e70 X5 351 M///Sport.

Also in the fold: 2004 X3 3.0, 6MT, Black Sapphire on Terracotta, port, Premium, Cold Weather.