I need the part number for the CCV pipe that goes from the square box on the valve cover to the air intake tube.
That's a G60 valve cover, On the G60, the square box connects to the intake pipe that passes by the back of the head. You appear to have the whole thing, it's just that rubber elbow. To hook this up to a diesel you're going to have to be creative.
that valve cover looks awesome, i'm i'm going to have to go spend some time i the bushes with my car now.