Well you have to improvise and there are multiple methods. The
fittings are called O-Ring Port by Weatherhead and Discount Hydraulic
Hose, commonly known as bump tube. They were used mostly for
automotive air conditioning, power steering, various truck usage, and
industrial usage. The size Ford used is #10, 7/8"-14 Threads per
Inch. However if you can find current 7/8 crimp fittings they are
usually 18 TPI and typically aluminum not steel (for air
conditioning). Discount Hydraulic Hose has adapters to JIC, see link.
I've used and seen various methods including adapters, standard
fittings brazed to the tubing part of the old fitting, new crush
collars on the old fittings, and new #10 crimp-on ORB-SAE fittings.
#10 O-Ring Boss fittings are 7/8"-14 straight thread like the
originals so they fit, but I use thread tape and sealant plus the
outer O-ring to make the seal instead of the original inner O-ring
seal method. If interested I can post pictures.
Discount Hydraulic Hose adapters