I just rebuilt my oil cooler with new orings and gaskets.
While cleaning everything I mixed up which end went on what end of the cooler.
Looks to be reversible, so I re-assembled with a tab in the center of the allingnment mark and bolted back on.
I got it back on the block without any trouble.
The cooler tube has tabs on each end about 30 degrees off from one another.
Using the tabs there's only 2 ways each end can go.
I was just worried that the tube itself might not be reversible.