Its a Gale Banks turbocharger and with all the research and testing to get the most efficient combination, there is no way the specs are readily available.
Since it only has to make boost to 4500 rpm on a 4.0 liter engine, the compressor inducer is likely to be no more than 50mm.
The work is in in making the compressor highly efficient at a 1.4 pressure ratio (6 psi boost) which most turbochargers are not.
Generally a higher compressor A/R is required along with considerations on compressor trim and blade count and contour.
The turbine side is set-up for very quick boost response at low rpm which normally requires a small turbine housing A/R with twin scroll housing for wide power band response.
You can always try calling them for info. I could be wrong about their willingness to share.
or you could simply buy one of the turbochargers for the Jeep kit.