Rear axle hard line brake fitting size?

Does anyone know what size the fitting is where the hard lines connect to the soft line on the rear axle? (In the block held down by the breather fitting)


I need to start piecing together a collection of brake lines for the rear axle that I'm building (Its a Ford Dana 60 with GM 3/4 ton calipers). I need to make a hard line that will mate the GM caliper soft lines to the center Jeep soft line block.

Thanks....

3/8-24

Thanks!