You can also grab the fitting out of any mid 80s GM vehicle with lets say an olds 307 in it or probably any chevy truck in that era or later. The newer fitting will have the metric line with o ring style just like the jeep gear box, but it will still thread into your old pump.
Then you can just get a hose designed for the same mid 80s GM and it should work fine for you as long as it is similar in length as your original. That's what I did in my 70 GTO anyways, I added hydroboost brakes at the same time which also had the metric o ring fittings, but that's another story altogether..
__________________
1970 GTO 458 CID .040 over 4 Bolt 428 Block, Forged Eagle 455 Crank, 295 CFM SD KRE D-Ports, SD Old Faithful HR Cam + Comp HR Lifters, PPR Maxx-lite rods, Racetec pistons, PRW 1.65 SS Rockers, 900CFM Holley HP TBI, Performer RPM, Hooker Super Comps, 3" X-Pipe into 2.5" mufflers/tailpipes, 2.75 1st TH400, Continental 13" Converter, 8.5" 3.08 Posi.
Everything installed, fired up and tuning has begun!