If your Boat has this type of Dash, then this mount will fit.
The 1 1/2" spacer is required for Solix 15 console mounts for the 621FS.
All others are optional for the 1 1/2" steering spacer.
Spacer can be purchased here - 1-1/2" Steering Wheel Spacer
If you have smaller units that are not listed in the drop down menu for GPS/Sonar, then go to the 619FS/620FS/621FS (2015-2019+) Single Dash Mount
Disclaimer: The Apex Factory Gimbal brackets have a Hole Pattern in them that "Does Not" match any previous hole pattern used by Humminbird in the past. We will send a Hole pattern with mounts that have a Apex model graph and you will need to mark your factory Apex gimbal Bracket and drill 9/32 holes them to match our pattern. Note: The BBT Cheyenne Series Apex Gimbal Brackets will have the same hole pattern in them as Helix and Solix Gimbal Brackets.