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What are they called and is it specific to that shifter?
Shimano call it a lever boss cover, and they are pretty agnostic with respect to the levers (assuming Shimano SIS) but there are two curvatures, a small one for 1.125" steel down tubes and a large one for aluminium/oversized.
e.g. https://www.sjscycles.co.uk/gear-spares/shimano-sl6028-lever-boss-cover-for-alloy-frames/
I have these 500EX shifters but one is missing the circled items. What are they called and is it specific to that shifter?