I am considering putting a Jagg 10 row oil cooler and thermostatically controlled adapter on the Road Glide. Looking at the oil filter mount that is on this engine, I see two threaded and plugged holes in the front of the oil filter mount. Nothing about this in the manual, but it sure looks like npt for oil out and return lines.

Anyone have info on these? Does the oil go through the filter first, then to the output? Where would I find a diagram or picture of explaining how these are configured?

Thanks!