Gotcha.

Checked realoem for my own M62 and the part number is correct. Size is listed at 80mm.

Checked the history of that part and it is used on E39's. It did supercede an earlier part number but the old part was 80mm too.

Part number on box checks out, I wonder which is correct, the installed part or the one in the box? Packaging errors do happen sometimes.

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04 X5 3.0i auto
03 X5 4.6is