eBay
 Trolling Motor Bracket.  Designed for mounting transom style trolling motors to the bow of most fishing boats, or to any flat surface, such as a swim step.

Made of durable 5052 marine aluminum.  Brackets are CNC Waterjet cut, TIG welded, and Powder Coated with a textured matte black finish. 

Bracket is 8" long x 6 3/4" wide.  Trolling motor mounting face is 6 3/4" wide  x 6" tall.  Also have a smaller bracket available for smaller trolling motors.  Please 'See other items,' for that.  Measure the width of the mounting screws to determine which bracket is needed.