Originally Posted by nikpottala

Rear air suspension does not mean it is w/o sport suspension. Air suspension is considered to be a self-leveling capability.
I ordered my shocks from Schmiedmann out of Europe and ended up saving money when compared to US suppliers. I found it difficult to find US suppliers who had the air suspension shocks. Apparently the valving is different than shocks without air suspension.

The standard non-sport BMW part number for rear shocks with air self-leveling is 33526755839.

Here's the Schmiedmann link:

Schmiedmann - Shock absorbers/springs and accessories for BMW X5 (E53) - New parts