2003 Chevy Blazer Oil Cooler leak
 

I have a 2003 6 cylinder 4X4 Chevy Blazer with an oil cooler leak. The lines have been replaced, but one of the inserts is leaking.
Does anyone have any ideas for a quick fix/repair for this issue? I'm told I need a new radiator, but at this point I'm just adding oil when needed. I hate an oil leak, and this thing is leaking like an old school bus.
Thanks for any advice.