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Had this same problem last year. It seems as though there are two 330i styles of rear axles you can get:
1. equal spacing bolt pattern on the diff flange. The flange that connects to the diff is bigger on this style. This is the one that you buy at the part stores or on RockAuto. Often called automatic axles.
2. The pairs of bolts spacing. The CVs have a thin flange on the diff side and use a different wheel speed sensor. Often called the manual axles. These axles are not supported by aftermarket companies and the cost of an OEM axle is ridiculous!

Your best bet is to find a junkyard and get an axle there. I think that there was a split in production at some point because I got my axle (paired bolt spacing) for my 2002 manual 5 speed 330i from an automatic 2001 330i, thus confirming that there isn't really an auto axle vs a manual axle (confusing, I know). Would also recommend staying away from cheap axles.
 
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