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The 6.5L engine blocks changed in 1996. They went to a different fitting for the oil cooler lines.
Looking up the 6.5L part number 10-8070102BA it shows it is a 7/8" IPT
I havent found the size for the 6.2L 14055586 but seem to recall it is 5/8" IPT
YMMV
Any Ace Hardware stores around?
Any hardware store with a larger selection of fittings. When I have test fired engines in the can, I purchased some barbed fittings to hookup a temp oil line. They where both the 6.2L and 6.5L. Off the shelf stuff. Sorry I don't remember the size.
I would take your fittings and test fit...
The threaded holes in the 6.2L block are standard (I'll have to check if they are metric or SAE).
I have seen guys use a reducing bushing to make the 6.2L fitting screw into the 6.5L block.