Let's get a little more technical.
Can I use a metric flare to AN fitting and mate that to JIC -6 fitting? Or does AN have to be mated to AN? Both are 37º just one is steel and one is aluminum, just wondering if AN is directly compatible with JIC or is there something else I am missing?
For the low side, I could care less what fitting is used as there should not be any significant pressure on the return unless something is pinched or clogged.
Never mind, I answered my own question for $7 already. No need to potentially strip an aluminum thread, and cheap heavy duty hose already available.
(SF01) 18MM x #6 JIC Adapter
18MM x #6 JIC male adapter fitting. Use to adapt to #6 AN type fittings on 80' & newer o-ring type ports on GM steering box's (high pressure side). Will also work on hydroboost brake boosters.
(SF02) 16MM x #6 JIC Adapter
16MM x #6 JIC male adapter fitting. Use to adapt to #6 AN type fittings on 80' & newer o-ring type ports on GM steering box's (low pressure side) or GM pumps (high pressure side). Will also work on hydroboost brake boosters.
(HE39106) 16MM 90 Degree Return Line Adapter
16MM O-ring type adapter - 90 degree-3/8 hose fits over fitting
Will fit all return side port on Saginaw / Delphi type 1980 and newer.
I see that they also offer -8 and the SAE inverted flare.