You can purchase individual or boxes of external circlips at good hardware stores or online .. eBay! All you need to measure is the shaft diameter of the pivot pin and then match the circlip size to that, as they are sized by standards.
ended up going to my LBS and they were gave me one off of a broken sram shifter they had in the back.
@motoko started
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You can purchase individual or boxes of external circlips at good hardware stores or online .. eBay! All you need to measure is the shaft diameter of the pivot pin and then match the circlip size to that, as they are sized by standards.