Manitou iva kit for mattocthe manitou iva kit is a 5 position spacer system to tune positive air chamber volume and increase progression features genuine manitou spare partcompatible with all mattoc proexpert 26 and 27 forks as well as the magnum 27 and 29 forkseasily installed to replace the existing air spring top capbuymanitou frame sparesfrom chain reaction cycles the worlds largest online bike store