Look at the pics from @SNLC in the following post.
This pretty definitive that it's one piece an the part number is what you need.
Post in thread 'What Did You Do with Your 80 This Weekend?' What Did You Do with Your 80 This Weekend? -...
Damn!
I think that's part of the timing cover casting!
Maybe it's time to do a head gasket as PM, replace your timing chain and slippers and all the other stuff on the front.
Maybe to "get by" you could clean it well, smear some epoxy in there and on the outside in order to seal it and hold...
Did you replace the little pipe with the two O-rings on it? How snug does it fit inside the new bypass pipe?
How are you installing the O-RIngs? Sometimes, depending on HOW you install them you could be cutting them when you roll them over the sharp edges or stretching them or using a...