My 2006 X5 M54 with 143K miles outer CV boots just cracked.

Realoem lists:

1. INNER boot: straightforward, only 1 PN.

2. However, OUTER boot has 2 choices...
* 31607565316
* 31607507402

Does anyone know why 2 choices?

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT