Your best bet is to try Earls or Aeroquip and see if they have a fitting that will work, they have some incredible fittings that you will be surprised.

10mmx1.0 is a very common pitch, lots of Japanese cars maufacturers use this. You problem is that you need a flare on the base of each end.....

Other than that, try any local hydraulic repair shop....or you can have a new one made at any machine shop.

I do alot of custom automotive work and end getting alot of my custom fittings that cannot be sourced, just made.

Not sure if that helps you or not.

Yasin