What I have done is remove the plastic from Sun Tour stem shifters, trim to fit, and install on the Shimano barcons over the existing rubber. Dip the plastic Sun Tour bits in boiling water for a minute or so to soften them up.
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)