If that's the case i don't have a clue what hose part number you would be looking for.
All the parts catalogs show hoses that bolt directly into the caliper, and that's the type of hoses that i have in their boxes on the parts shelf.
That's why your having a difficult time locating hoses that you need on your calipers.
You certain that they never have been replaced with something else before you owned the car, after all its 55 years old.
In 1970 the calipers used on the cars were considered to be the "WIDE MOUTH" design, a one year only style.
Are your calipers of this design?
But they still used a brake hose that screwed directly into the caliper body.
If not your car most likely has the calipers replaced with parts store units.
Show us a picture of your brake hoses, what your working with, that you want to replace.