one the left is OEM honda (black), the right is a NOS victor Top is a Rong shin which is off a powerdyne with the same style wheel hub...only not as wide.
they all use the same brake shoes, sometimes marked ask or agk. Judging by your pics an actual z50 plate and brake arm would be right on for spacing ect... which incidentally is the same pads that 1969-70 rupps used, so the guys on ebay that sell them for $45 are just selling you a $10-15 set of honda replacement shoes :smile: