The fitting that screws into the valve body looks an O-ring boss style fitting. These can be either SAE American threads or metric ISO 6149. Ports styles are very similar
#6 SAE is 9/16-18 threads
#8 SAE is 3/4-16 threads
Metric sizes
M12x 1.5
M14x 1.5
M16x 1.5
M18 x 1.5
Threads into the valve body are British. Took the biggest truck/hydraulic shop in 50 miles nearly an hour to come up with something that fits. It's ugly, but it works...for now.