That'* the thing... Me/dad tend to snap up any still-good-looking air suspension parts that we run into... We'll get lucky, and I'd say I have a few hundred bucks (if brand new) worth of spare stuff... Though most of it prolly really is junk, I couldn't tell you what really is still good and what isn't.

mine sags in the rear too, but i think its because we are too cheap to replace the air struts that are 3 years overdue