Gladly, I have a set of rears, one rear is good, one is bad. Anything for a good cause but shipping them to CA from MD will be pricey tho.....

FWIW, I think AD is a terrific feature even though I was barely aware of its existence at the time I purchased the car. Life was very busy at the time :-)

I replaced my rears with used ones from a lower mileage car and it runs well. Was plug and play. Would be great if somebody would set up an op to refurbish AD systems as they are becoming more prevalent, not just on BMW.

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2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior

Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.