Thanks for all the help with these.
This is the answer to my query regarding Shock Absorbers fitted to my 1930 Chrysler Model 70. The answer provided by Apple Hydraulics.
I am assuming that Chrysler might have fitted these to their export models.
“Shocks like yours used for a year or two on big cars like Packard or Pierce Arrow or Chrysler (with different arms for every application).
This "version 1.0" is replaced with shocks that have plugs on both ends of the body and, in late 1930s with shocks like 1941-49 Cadillac rear (for example, see pictures on https://www.applehydraulicsonline.com
under Cadillac). All measurements stayed same (body dimension, spacing between mounting holes).”