According to both the email confirmation and the packing slip for my order, I ordered the following from Arnott:
1 A-2504 Arnott Rear Left Sport Air Spring - 00-06 BMW X5 (E53) w/Rear Leveling
1 A-2503 Arnott Rear Right Sport Air Spring - 00-06 BMW X5 (E53) w/Rear Leveling
Only one of the Springs (pictured below) has any type of product number labeled on it. You can see where they specify Sport on the shocked on the right side of the photo.
The shocks are photographed with the Left Spring on the left and Right Spring on the right
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