P&S only made one version, what is so different about yours?
Some dragster guys use to cut down the bushings flat to the top of the spindle to run solid flat arms and caps, and the heavier F/C ran the full bushings with holes in the arms. are they stamped P&S?? Rebushed many a P&S (old and new) when TAK (P&S) was around and they were all the same kit/bushings