As fate would have it, the inside diameters of these giant AN fittings were the perfect starting size for my 1/4" NPT (National Pipe Thread) tap. For the sake of space, I beheaded both the fittings, then tapped them out.
I then went ahead and plumbed an aluminum line from the oil filter to the forward side of the oil cooler. Not too bad.
Tune in next time.