v8 oil cooler pipes

Hi all,
I've got a 90 with a Disco 3.9 v8 in it. The guy who owned it before me decided to replace the radiator but keep the oil cooler bit..



Now I'm looking to fit a Mocal oil cooler. When I removed this cooler, one of the pipes into the timing cover is 'normal', the other has a strange hole/plug end:



My question is: Can I just plug the existing holes and use a sandwich plate to take off to the oil cooler? Or do I need to use this special connector as pictured? I've done some research online but the results are inconclusive. I think I have an intermediate serp timing cover, and I've seen reference to this pipe bunging the 'easy way' for the oil, but nothing as to whether I can use a sandwich plate instead.

Cheers,
Kev.

I can’t answer your question,
But your first picture has answered a question on a thread i started a couple of weeks ago.
Thank you!