Digging up old thread to report another finding, this result taken from KNOWN originals from my 11/2/66 built San Jose example.
They BOTH are the "MS" stamped version. (like pictured in Reply #1) For what else it is worth, the bushing/shaft is spot welded in, not crimped AND has the yellow paint or dye obvious on one end of the rubber. This result is from the one spring perch or spring saddle, as the title of the thread calls it, that has never been restored to date. Unfortunately, for the other spring perch, I replaced that bushing back in '97 so those details are gone now. I re-used the original perch then, only replacing the bushing & shaft.
I've uploaded several pictures. I have take more that I did not upload so if some detail needs viewing that isn't seen in these, just ask.