I don't know what the differences are, however the ebay units match my LH STD rotation distributor tag exactly except for the date code. E5JL-12100-CA # 7020S If your needing springs this may be the way to go as I suspect those are the same for RH and LH rotation units. Perhaps I'll pick one up and compare it to my original.
Hard to make out but it's the same.
a spoon-shaped eating utensil with short tines at the tip