I bought the RS Technik sensors off of eBay for my 2011 and they work just fine. I went to 20" rims and left the standard 18's with OEM sensors as my winter setup. I've had ongoing vibration issues with the 20's; they are not OEM and I regret putting the money into them. When I can afford it I will be going back to a OEM 20" set.

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2007 328i Sport, Monaco Blue
2011 X35D - sold -Space Grey
2004 X5 4.4i - sold - Kalahari Beige
2001 X5 3.0i - sold - Pearl Beige
2006 325i Sport, Sonora Beige
2000 323i - sold - Sienna Red