Im sure it shares a lot of the suspension components with the Maxima, possibly the lowering springs as well. If you are looking into air suspension, you might want to talk to the guys down at Revision.
just buy the ebay coilovers for maxima....i got those on and im jus using the spring no sleeves! bouncy ride but looks hellaflush and worth the 80$ pm me if u need more info bout this i have a set of coilovers lmk