The 4-series part number should indicate something in the 1980s? As this was what appears to be a Mopar Parts situation rather than OEM Chrysler Parts, it could be "anything", unfortunately. Which can mean they were in a separate catalog than the normal Chrysler Parts Manual.
From about the middle 1970s for "a time", Chrysler Mopar Parts was seeking to emulate what AC-Delco did for GM and Motorcraft for Ford in selling replacement parts for vehicles other than their OEM base. That grand scheme was not successful and it quietly faded away after a several years, as the number of Mopar Parts jobbers also went away.
Might do measurements of "fully extended" and "fully collapsed" dimensions of the centerline of the bushing holes. Any stamps in the outer housing, at the crimp points where the bushing housings were attached, might be important, too.
Just some thoughts,
CBODY67