This 1/2" thick adaptor plate is made with High Density Polyethylene specifically engineered for marine applications. This plate will fit the H- rails on your 2019 Outback and allow use of both rails to create a stable platform for your fish finder when used with a t bolt style mount.  The slot allows for precise positioning of your device based on your preference.   Includes plate, 2 T- bolts, and 2 Knobs.Now all hardware is Stainless Steel