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Actually I just remembered: I found this guy that sells just an adapter.
Not sure if these work with the 6.2 or not but would be worth an email to the guy
http://www.leroydiesel.com/Engine_Lubrication.html
scroll to bottom of page.
As far as I can tell, the couplings your after were some goofy GM only thing.
This guy just cut them off, flanged the aluminum and used a regulat compression fitting.(edit: goofed the URL but you get the idea: cut tube, flare it and use compression fitting with proper adapters for your...