It's really really hard to get seals and parts to rebuild a rack properly, let alone any good quality stuff.
If the problem is the rack you might be better off with a good used one, or maybe someone can chime in if they know of a good quality rebuilt, or maybe new from BMW.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)