I am in the process of putting my 2.3 back together.
I came across the bypass bolt that is located on the back of the block and it needs to be replaced. I went to mitsu and bought a new bolt but the one I got was slightly different. In the pic you can see one of the bolts look like it has a fitting inside, that is the original bolt. Does anyone know if the more straight through design will work? It physically threads in.

 

figured it out. the bolt that belongs to the oil bypass hose is P/N MD373334 while the other bolt belongs to the turbo hose and is P/N MS650013.