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I'm pretty sure I know the answer to this but just want to run it by the board. I am ordering the M6 style wheels from bmwwheels.com. My plan is to swap the rubber and sensors from my stock/OEM M5 wheels. My car is a 2007. Any issues?
 

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I'm pretty sure I know the answer to this but just want to run it by the board. I am ordering the M6 style wheels from bmwwheels.com. My plan is to swap the rubber and sensors from my stock/OEM M5 wheels. My car is a 2007. Any issues?
There are no issues swapping tires, however there might be some issues with the sensor mounting.

The TPM assembly mounted in the wheel is made up of 2 parts, the sensor and the valve stem. The sensor is the same for all BMWs. There are 4 different types of valve stems. The type is indicated by a color (none, green, black, orange), but this is only visible inside the wheel.

Looking at realoem, it is not clear which is the correct valve stem for the stock M5 wheel (either green or black):
http://www.realoem.com/bmw/showparts.do?model=NB93&mospid=48807&btnr=36_0831&hg=36&fg=15
http://www.realoem.com/bmw/showparts.do?model=EH93&mospid=49343&btnr=36_0966&hg=36&fg=15
This post indicates that green is the correct type:
http://www.m5board.com/vbulletin/showpost.php?p=916578&postcount=24

The stock M6 wheel uses a different valve stem (no color).
While the M5 (whichever one it is) might be close enough to work, it is not the correct part.

The correct M6 valve stem is: 36111095375
I bought it from Crown Automotive for $10.07
https://secure.webmakerx.net/Default-2.aspx?hostname=parts.crownauto.com

Attached is some interesting information from the Beru website, and I have also made a little part number reference chart.
 

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