Oil leak

2006 2.3L, found oil on the bottom of the oil filter. Oil filter is tight. Oil seems to be seeping from the joint of the oil cooler and the filter mount. Anyone know how this is put together? I understand there is an O-ring between them but I don't see a way to separate these sections.

Had to remove water lines and remove four 10 mm bolts that hold the whole assy to the engine block. On top was a large bolt in the center. Put the assy in a vice to loosen the big bolt. Sections then separated and I was able to scrap off old gasket. Used Permatex Right Stuff gasket stuff and put assy back together. All good now!