I think the the inner boot is the same for both A and B axles. So you ordered a "kit" with both boots for your 2002 and the outer boot (with no part number) is the harder one and the original is soft?

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