I can second this - replacing rear air bags is a relatively easy project. Pull the fuse (rear fuse box) when you do it and replace after everything is reassembled. Very good reminder to indeed (as suggested) replace the rear upper control arm that frequently has play and gives you FAR more negative camber than needed. Arnott products work well, lifetime warranty. Buy directly from them on line.

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2002 Euro X5 (E53) 3.0 diesel (M57)
5 speed manual with UUC short shifter.
Pre-xDrive NV125 transfer case (chain & gears).
Factory Xenon headlights, Spyder LED tail lights
Updated vortex crankcase breather.
Motorsport dead pedal, factory fire extinguisher, factory first aid kit, factory F&R mud flaps, factory PDC

Bilstein B6 shocks F&R
Redline oil has replaced "lifetime" fluids (F&R diff, manual transmission, transfer case and P/S).
Dimple magnetic drain plugs in all compartments.