What turbo are you rebuilding? the T3?
there are a few good tutorials on the web for rebuilding your turbo. I did mine just fallowing the directions I read here, and fallowing a tutorial I found on google.
When I ordered the turbo rebuild kit (ebay kit) they did not have a the correct seal for the compressor housing. I could not find one anywhere. so I measured the compressor and ordered a seal form McMaster-Carr they only sold them in a 25 pack... Let me know if you need one