GM fittings they're talking about are the "push to connect" style...
Double flares are usually for brake lines
45 single flares are used in many gas lines etc. BUT the style of flare etc depends more on what your RECEIVER style is... so you kind of need to figure out BOTH sides of what fittings you're using before you can know what you need to make up.
The AN style fittings use a single 37 degree flare...
So you see why you're not getting an answer? It's hard to say "do this"... because nobody would know what else you're using/trying to do.
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