Taking the socket joints off really worried me. They are on really tight and there are no flats on the rack shaft to hold. I was almost sure I must have damaged something but everything seemed fine after. I actually didn't tighten the new socket joints nearly as much and put a little lock-tite on instead. Maybe we squished the teflon bushings when we changed the socket joints ? I can't seem to get much more info from that link you posted but I have a feeling they are only selling the seals. We need what is shown on that E46? picture that is linked. Maybe the bushings are the same? It might be a good idea to look for parts according to the rack not the vehicle.

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