I'm installing a pair of bar end shifters for my TT bike and I noticed that the rear derailleur shifter, the one with the clicks, seems to be on the left aero bar instead of right, I can't see it fitting right if I swap them over, is this normal for TT bikes to have the rear derailleur shifter on the left side instead of right? I have Shimano 9spd Dura-Ace shifters.