Hi Max- You have done your share on this board, don't worry about asking. You may just get what you pay for with my free suggestions {grin}.
When I was looking for a couple adapters for the fuel pickups for my Swedish built boat, the usual excellent sources in Seattle came up empty. They all said that the place of last resort was Fittings, Inc. The counter guy looked at my part and went right to the bin for the matching part. Gotta love parts guys who know their threads and their inventory!
I hope they can help you.
I have to track down a large diameter nut for my boat's new WIFI antenna. I took more interest in a passing kayak today and the original nut hopped overboard as I fumbled. Gobi wins again.