This kit gets good reviews on WW: http://www.ebay.com/itm/Shimano-Dura-Ace-Di2-EW-7975-BATTERY-INSIDE-SEAT-POST-Internal-Wiring-Kit-/300626170301?pt=LH_DefaultDomain_0&hash=item45feb751bd
@Dammit started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
This kit gets good reviews on WW: http://www.ebay.com/itm/Shimano-Dura-Ace-Di2-EW-7975-BATTERY-INSIDE-SEAT-POST-Internal-Wiring-Kit-/300626170301?pt=LH_DefaultDomain_0&hash=item45feb751bd