Included with the Vertical Track Adapter are two different Track Disks. These two Track Disks are designed to provide a snug fit in either the standard YakAttack width GearTrac (GT90, GTSL90, GT175, GridLoc MightyMount XL) or the wider opening of the YakAttack Top Loading family of GearTrac (GTTL90 and GTTL175). If a track system came included with your kayak, try both of them and determine which one will provide the best fit.
