These Givi SR2139 Monorack Arms Yamaha Tracer 900 2018 on, which includes the Yamaha Tracer 900 GT, are designed to accept a choice of mounting plates which in turn will enable corresponding Givi Monokey Cases or Givi Monolock Top Boxes to be fitted. For a Givi Monokey rear case a Givi M8A Aluminium Monokey Rear Plate, or a Givi M8B Black Aluminium Monokey Plate, or a Givi M5 Monokey Plate and for a Givi Monolock Top Box either a Givi M5M Monolock Plate or a Givi M6M Monolock Plate are required. There are several pannier rails to choose from for additional luggage including; the Givi PLR2139 Rapid Release Monokey Side Case Holders, the Givi PLXR2139 V35 or V37 Rapid Release Pannier Holders or the Givi PL2139CAM Outback Trekker Pannier Holders. The instructions, the 2 black support arms, the rear support arm bracket, washers, spacers and the locking nuts are included with the exception of the rear carrier and top box as detailed above. The Givi EX2M Expansion Plate is also available, which will fit onto various specific Plates, enabling up to 50 Litres or 6 Kgs of soft luggage to be fitted. Please note that neither an additional Givi Stop light or a Givi Top Box remote opening device cannot be used with the Givi M8A or the Givi M8B aluminium Carriers as the plates do not have a pre-drilled access hole. Please note that these are not suitable for the Yamaha Tracer 900; you will require the Givi SR2122 Monorack Arms Yamaha MT09 Tracer 2015 on.