Use JIC instead of AN. They are identical in most regards
and interchangeable. JIC  is industrial and much cheaper. Best
of all you can get them in steel or SS. Steel is ten times more
fatigue resistant. JIC is supposedly 40% weaker than aluminum AN but we are
not designing space shuttles here. Use steel or SS instead of aluminum
fittings. Much much stronger. You won't notice the weight difference.
It is not like we are using thousands in an airliner.

Earl's Supply sells what looks likes AN but is not real AN.
However Earl charges AN prices.

Best of all use half inch soft steel tubing instead of Teflon lined SS braided
hose where ever possible. Much much cheaper. Don't use aluminum tubing. Aluminum
fatigues and cracks much easier than steel or better yet SS.

The rotary engine has much lower vibration levels so a lot of
plumbing that might not work on an aircraft piston engine works
fine on the rotary.

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What is the difference between aircraft AN and JIC fittings? Quote from Parker Aerospace Fitting Solutions Series No.11


Aircraft AN fittings are manufactured to MIL-F-5509 per AN (Air Force - Navy Aeronautical Standard) and AND (Air Force - Navy Aeronautical Design Standard).
Industrial 37 degree flare fittings are manufactured to meet SAE J514/ISO-8434-2. Straight threads are per MIL-S-8879C now SAE-AS8879.

These two fittings function the same, they look the same, AND the industrial version is much less expensive to manufacturer.
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Paul Lamar