found more info here on vortex..
http://forums.vwvortex.com/showthread.php?3516484/page3 cant see much for turbine though
KO3
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5303-123-2018
Inducer diameter: 33.63mm
Tip height: 3.71
Exducer diameter: 46.02
5304-123-2201
Inducer diameter: 38.48mm
Tip height: 4.67
Exducer diameter: 50.95
5303-123-2011
Inducer diameter: 31.45mm
Tip height: 3.12
Exducer diameter: 44.96
5304-123-2007
Inducer diameter: 36.02mm
Tip height: 3.89
Exducer diameter: 49.96
and for the KO4:
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5304-123-2029
Inducer diameter: 37.95mm
Tip height: 4.39
Exducer diameter:50.95
5304-123-5010
Inducer diameter:34.90mm
Tip height: 3.61
Exducer diameter: 49.96
5304-123-2032
Inducer diameter: 34.54mm
Tip height: 3.28
Exducer diameter: 50.95
5304-123-2202
Inducer diameter: 37.74mm
Tip height: 4.42
Exducer diameter: 50.95
5304-123-2023
Inducer diameter: 36.65mm
Tip height: 4.04
Exducer diameter: 50.95
5304-123-2018
Inducer diameter: 35.97mm
Tip height: 3.68
Exducer diameter: 49.96
5304-123-2007
Inducer diameter: 36.02mm
Tip height: 3.89
Exducer diameter: 49.96
5304-123-2000
- see above under KO3 section
5304-123-2005
Inducer diameter: 34.90mm
Tip height: 3.73
Exducer diameter: 49.96