Well, without seeing the car, I would guess that it's probably a bent lower A-arm. Now you might have other connections that are bent, but without seeing it I couldn't tell you much else. For good prices on stock stuff though, contact Greg V over at Mossy Nissan (
www.mossyperformance.com - get the number and ask for Greg). If you need more info, do some searches over on
http://www.b15sentra.net and you'll get loads of info. Good luck man.