Porsche650

I wanted to know what turbo i have the previous owner stated it was a Saab 9000 T3 but i don't know what trim. Do i need to measure the turbine and compressor to know the trim or are the compressor maps such as Garrett 45,50,60 the trim of the turbine on the intake side? the exhaust side inducer is the same as the exducer. Seems like one size.Any ideas? Also the turbo is a .42 intake and .48 exhaust hosuing and S/N AIM0030, P/N 0273979.