I just received the following information from my lead engineer that you requested.

“The Comfort and Sport versions of the air springs have the exact same sleeves and travel range (stroke). The difference lies in the profile or shape of the lower piston. The rolling lobe design of these air springs allows for spring rate changes by altering the profile of the lower piston. Thus the sport models have a larger, more aggressive shaped piston to increase the spring rate of the air spring. While the comfort piston has a slightly lower, less aggressive profile for a more comfortable ride feel. Now, with any BMW, they ride sporty or stiff (my opinion) as it is “The Ultimate Driving Machine” tuned for performance. I can advise that the Sport and Comfort air springs are interchangeable on the E53 X-5 as they mount in the exact same manner. Nothing has to be altered, including ECU, sensors or compressor. As for the height selector beside the steering column, any E53 X-5 with 4WAS will have this height selector switch. If the truck was only equipped with rear air load leveling, it will not.”