to find out what turbo it is
the intake housing has a number on it
if its 16v its a rb20 turbo
its it 45v1 , 2 , 3 or 4 its a r33/vg30 turbo
if its a number other than that i dont know
and to find out if its ballbearing or not there will be a 10mm nut near the water/oil lines
just a single nut