Need help Identifiying This Turbo
 

I know its an AiResearch T3.
It has an internal Waste Gate with actuator arm internal as well.
Inside the exhuast housing where you mount it to the manifold is stamped "48"
Inside the output of the compressor housing is stamped a "42"
It has a 4 bolt pattern for the down pipe.(Mercedes Turbo ?)
What size is this turbo ? a/r etc
Thanks

http://home.comcast.net/~iflybye/pic...h_T3_turbo.jpg
http://home.comcast.net/~iflybye/pic..._T3_turbo2.jpg
http://home.comcast.net/~iflybye/pic..._T3_turbo3.jpg
http://home.comcast.net/~iflybye/pic..._T3_turbo4.jpg