Bilstein was no help - I asked for data sheets or a summary of differences between RWD and 4WD shocks/struts and here's their response: I’d be happy to assist you. These are the part #’s you want to use on your 2009 Nissan Pathfinder SE 4wd (4X4). 24-197427 & 24-197434. RWD is just that, onl...