I went with Bosch/Pierburg pump only. I don't have the degraded plastic problem like some others seem to. I did spend a bit of time trying to figure out if the arrow should go up or down on the rubber mounts go though!

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