A-2738 Arnott Rear Right Air Spring BMW 5 Series Wagon (E39) - installation manual ↗
Vendor install sheet for an E39 Touring rear air spring: wheel off, cargo floor out to reach the spring top, deflate via the air line, swap the fitting clip, unbolt the lower mount and fit the new bag. Warns the system holds up to 10 bar and should be done with BMW diagnostics at hand.
Tools mentioned: Jack and stands, sockets, BMW diagnostic software
Right-hand spring; left-hand sheet is A-2737.