You might try contacting one of these fellows. They make and sell a lot of AN hoses for aircraft. One of their specialties is making custom fittings. They had separate companies, thus the differing email addresses, but have joined forces recently.
Aircraft Specialty Flightlines
https://www.aircraftspecialty.com/
Steve:
AIRCRAFTSPECIALTY@GMAIL.COM
Tom:
TSFLIGHTLINES@GMAIL.COM