Watch out with Adsit. There was a thread on here a few months back with some downright scary stories about their cutomer service. Do a search & read it if you're interested. Make sure you understand that if they screw up and send you the wrong part (or a bad part), YOU will pay for all shipping (including return S&H), yes even though it was THEIR fault!! Positively disgusting policy IMO.
I'd try Potomac German (pgauto.com) or Silver Star (silverstarrecycling.com) for used stuff, I've dealt with both and they're pretty decent shops. YMMV, etc.