I finally shelled out for a set of Bilsteins for my X. I got the 20% stiffer but I'm not sure if these are the extended length. I used the part numbers other people on XOC provided. RIght now I have the PML with AAL not shackles.
I used the b46-1099-H0 and the b46-2126-H0
The installation was a bitch and a half. I never expected the front shocks to be easier to install than the rears, but they were. The rears were a huge pain in the ass to install but I got them in.
I love the ride!! In the great white north of MN we have lots of potholes for abuot 9 months of the year so smoothing out the ride and the speed of rebound has been spectacular.