I am pretty sure I have the P/N numbers and boot types listed in another thread. The hard boot has the larger axle shaft.

It would be interesting to find out if anyone has the type b axle with the hard boot original from the factory or was it just used as a BMW supplied update.

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