I bought these but didn't need them after all. I opened the original package but that is all. They are pretty cool looking as well as cut some weight since one doesn't need the plugs (~ 50g each). $60 + shipping. Barb
Photos & details from Trisports
The Jagwire BarCon shiter boss mount kit is a quick and elegant way to upgrade your bar end shifting. The Jagwire Barcon shiter boss replaces the aluminum shifter boss in Shimano's bar end shifter, which drops the weight and adds some extra color to your front end!

Specifications:

Compatible with Shimano SL-BS series bar-end

shifters

External mount compatible with round areo or handlebars

Includes shim for 22.2mm bars

Kit includes: left and right side mounts, gray

housings, slick stainless shift wires, end caps, donuts and tips

22 grams each