Yeah, dumb question...

I see the one on the top, but where is the return oil line?

 

On the bottom going down into the block right above the oil pan towards the front of the engine. Atleast it was that way on my little turbo when i had to T into the line for my twins.

 

On the bottom.

 

Yeah, I'm a tard - how hard are they to replace?

 

Two bolts bolting it to the bottom of the turbo and then its pressed into the block. Some say that its easy to get out of the block by just grabbing it and pulling it out. I must be a wuss or something because I fought with mine for along time

 

On a '94 the lower part of the metal return line is connected to the block by a 3" or so rubber hose and two hose clamps.
Real easy to remove