Need name of part that holds door open on 71 Scamp!

That is correct. The hinges on my 69 Dart are the same (top and bottom) as my 1990 Dodge Power Ram.
On a related note, that same S spring is found on early shark Corvettes, and always breaks. The Vette vendors sell a replacement S spring, but a special tool is also needed for installation. It is not easy to replace this S spring, and I have heard many stories of guys getting hurt trying to install it.
Best to buy a new hinge because if it is worn enough to have broken the spring, I would imagine the pin is also worn.

George