Brake fitting size?

[6togo]

Anyone know what size the rear brake line fitting is? I want to use a adapter to convert to AN and was told it was 3/8" but it's bigger than that is it standard or metric threads? 7/16x24 maybe?
Chris

 

[6togo]

Anyone?

 

[MR.GN]

9/16 - 18 i beleive

 

[6togo]

I dont think it's that big i think it is either 7/16 or 10mm.
Chris