I'm not sure what you call this piece, but I am missing the button/cover/??? that goes over the downshifting lever on a shimano front derailer control (the part you press, not the actual mechanism) - is it possible to get replacments?
i guess the trigger itself, not the display, but the piece oof plastic that you push on.
You're talking about the plastic piece that your finger pulls on, not the metal lever that the plastic piece covers the end of, correct?........Your LBS can probably order the part (it may come with the lever and the end piece together), but it will be expensive for what you're getting. But if you need it, you need it.