From another thread. The prelude part only works if you do not have a hole on the side of the block.
I may have found a better oil cooler barb thingy... It's from a Prelude (H22A4) . I noticed it on Darton's Honda instructions for their sleeves. Had to try it out. It works!
If you can't see the pics, the part # is 11107-PK2-003. Also, there's a sealing ring (washer) for the above part with the part # 90401-PR4-000.
Advantage here over the S2000 oil joint is it prevents crud from getting onto the threads at the wider opening.
S2000 oil cooler joint currently in place but not threaded in all the way.
Prelude oil cooler joint in place (not threaded in completely)
Quick test fitting of the hose.
P.S. I will shrink the pics down at a later time.