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Cosmetically poor 6770 shifters seem to go pretty cheaply, and if you're only using the Di2 electronics box in the shifters you don't need to hack hydro shifters - any will do.
Brommers-
Sorry, should have clarified, r671 are the time trial button shifters, not hydraulics
Fforiwr
Hmm thought as much, have seen mentions of 'just using it on the left hand side' but no rel evidence of it being done.
If I do end up going the DI2 route, then hacking the guts of r671 to shifters seems the best bet as they come for front and rear