I did find a better picture of the linkage and got a spring too!
Here is pic from the '67 Mustang Part Part and Body Illustrations', since the copy in the assembly manual sucks.
And a pic of the upper spring, which I P&Oed and then used T9.
[for the photogs: it's tough to take a picture of a part inside of a baggie. So many reflections.
Instead I placed the bag with part inside on white paper, turned off the lights (still daylight out and I have small windows nearby) and switched the camera to night mode.]