hate to say it guys, but i don't think bma knows what's going on either. i asked them to send me an upper timing chain tensioner (not the head), (for the same reason as russel wants it for) and they sent me item 10 by itself. i would have needed the spring, at least, in addition. i'm trying to kill some timing chain noise right now, but i don't have the time to call them back and get the spring and maybe the cylinder body and such....maybe when i get the brake lamp i need.