OP gave no level of exp on DIYing so it would be wise to point out the fact that DIYs without torque specs for fasteners are a disaster waiting to happen. The Bentley manual has the blower DIY with all tq specs and is around $80, that's alot cheaper then having to replace broken/damaged part or "living with" the rattles that come from undertightening.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!