Looks like you can unscrew those fittings that are screwed into the oil cooler. They are definitely ORB fittings (O-ring Boss) You can take those to a speed shop, or hydraulic shop and have them match the threads. Might be metric threads. Or call the dealer with that part number that's on the oil cooler and ask them...
Here is the OEM part for that fitting on Ebay.
15-19 Dodge Challenger Charger Grand Cherokee 6.2L Engine Oil Cooler Fitting (1) | eBay
That is kind of a neat oil cooler, what are you mounting it on?
