The 6 speed gear box to use for this mod is 88 slingshot onwards, the best ones are L onwards as the output shaft is longer where the sprocket goes on, this makes chain alignment easier with 180 rear tyre, the 1100 clutch fits straght onto the shaft using a bandit centre, you will have to drill the clutch pushrod hole out. the bike below is fitted with standard 6 speed box, it has had six starts and six finishes in the Classic TT, And no breakdowns.