And just to throw this out there, our TE60 measures out like this:
Comp wheel:
2.320" Inducer
2.950" Exducer
Turbine wheel:
2.559" Inducer
2.228" Exducer
Now, way back when, we used to offer what was called a 6027 turbo.
It used the same compressor wheel, but used the T27 Stage 2 turbine wheel.
That turbine wheel measured:
2.559" Inducer
2.121" Exducer
So, if I had to guess, I would probably say it is a 6027 turbo as the turbine wheel measures closer to what you found. It was rated at 580 fwhp and was slightly quicker spooling than a standard TE60 turbo.
These measurements were taken at these points on this picture.