Vic, it seems as if you had the extended length or figured out the "stroke"' of the shock you would be able to find a match on replacement shocks. Perhaps just the measurement of the tube itself would be enough? Finding a good parts man willing to help is the key, as you well know. Keep trying. Maybe if you post the measurments of your shocks on the barn someone could find a replacement match for you.
Clem, you are right about the parts stores and their computers, lol! I'm surprised they didn't ask if the car had airconditioning and automatic transmission. That seems to be the questions they always ask me! No one wants to go to the trouble of getting out an actual book and looking up parts information. When I go to my local NAPA for parts they like to ask what I'm working on. I used to tell them a flathead ford, now I just shake my head and say "you've never heard of it"! HA HA!