That's actually a nice solution to the problem I think. I tried reading through the listing and couldn't fully determine how thick the spacer is. It mentions 1 cm making it possible to install (if i'm understanding that correctly).

I wonder if it can be used on the chinese replacement front drive shafts as well...

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2003 BMW X5 3.0i -- MT5, 3.64s final gears, H&R lowering springs, K-Mac bushing kit
2007 BMW X3 3.0Si -- MT6