Rebuilding Trans Lines- Help Finding Fittings

BTango said

Yep. The issue is I can find the male ends all day long, but nothing on the female ends.

Searching for 5/16 SAE inverted flare fittings.

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Those are not inverted flare. Inverted the nut on the tube is male, AKA brake tube. The ones you pictured is a female nut, AKA SAE flare I think some cars did use inverted flare at the radiator I don't remember.