If your Boat has this type of Dash, then the z520 style mounts will fit your boat. This is the same dash as the 2012 and up following models:
Z117, Z118, Z119, Z518, Z519, Z520, Z521, Z522
You will also need a 1-1/2 inch steering wheel spacer for this mount, which can be found here.
If you have very large units and it is not listed in the drop down menu for GPS/Sonar, then go to "Z" Type Dash Single MEGA Mount