http://www.google.com/search?q=Turbocharger%20cartridges&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US
Do Not,DO Not,DO NOT! Get inveigled into ANY PRC JUNK !

If you're the slightest bit DIY you can "Rebuild" your own Turbo.

How to Rebuild a Turbo / Easy Turbocharger Repair with CHRA Cartridge - NEW Balanced Core - YouTube

Part 1
http://www.youtube.com/watch?v=PSZtP949JHU

Part2
http://www.youtube.com/watch?v=wqXe0ln7-WQ

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'84 300SD sold
124.128