I went that route with the Uro Chinese fan motor. I ended up sending it back after only a day. The Uro vibrated and was so loud on high that I couldn't even hear the engine running.

I ordered a Bosch from Peach Parts without the cage for about $100. I think the original is a Behr. If you carefully use a heat gun to warm up the existing fan cage, you can slide it off the motor shaft and install it on the new motor. Be careful not to melt the cage and make sure you pay attention to the placement of the cage on each motor shaft or you'll have to readjust to fit in the casing.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles