The ones I saw recently on eBay were entire sensors, with the sensors, crossovers, and connectors and are listed for the X5 specifically. These are different than the ones I first saw years ago which were just sensors that had to be spliced in to the wiring after the crossovers. These newer ones are about $130. I don't even see the spliced ones around, but I haven't gone on a dedicated search yet.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim