Lumina 3.1 oil cooler

Has anybody got information about the Lumina PD package oil cooler. The one on my 96 has started leaking antifreeze. I bypassed the coolant lines, but now want to remove it entirrely. Can I remove it by removing the threaded rod in the center that holds the oil filter, or does it have internal hex key bolts like the 5.7 Vortec?

The threaded rod in the middle does the trick per service manual instructions on SI.