I was noticing that on my 2007 E70 (75K) the Passenger Rear side was sagging. When i start the car it comes UP. When park overnight it Sags again.

Dealer wants ~$1800 to replace both Rear air suspensions.
Indy BMW Shop wants ~$1000 to replace both.

So I bought a Pair of Arnolt A-2642 for $317, get it shipped FREE, went to a local Auto shop and they did the Install of both Air suspension for $180. It took them ~90 min to finish the install, They have never done it before but they read the instructions which comes with the Parts. So far see no issues.

Total Out of pocket = $497.

Use this part.
https://www.arnottindustries.com/par...98_gid911.html