It is hard to find used components like those for xi. Most (if not all) the xi's are driven in snow country thus lowering does not make sense. Good luck with the search though!!!! Weekend bump.
2011 328i xDrive
Too much to list
2002 325i Steel Gray - SOLD (and missed)
1997 328i Boston Green - SOLD
1990 325is Red - SOLD (and totalled shortly after)