Shock fluid?

[rotorwrench]

It was probably sold in those 1 pint rectangular cans with the little pull off cap on the protuding spout. Ford sold a lot of products from wax & polish to 3 in 1 type lubricants & greases. Some of the old chassis parts catalogs show illustrations of the products like this. They were pretty generic and didn't have a lot of information on them like what is required now days.

Those old shocks were probably replaced more than they were serviced. It wasn't that expensive in those days and most folks would have looked at you kind of funny when you mention serviceing for their cars shocks. The guy at the service station was supposed to do that, or at least you hoped he was doing all that he was suposed to do.