This specific part, 64 11 6 920 365 will not fit 2003 325i. There is a semi-circular notch on one side of each properly installed fan resistor, but this part does not have this notch. Without a notch, the part will not pass the securing clip. We actually broke the clamp and figured the screws were just holding it in place, but even without the clamp the part wouldn't fit properly. tl; dr: wrong shape, doesn't fit.
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