Universal Seat Riser Brackets by A Plus
From A Plus Rod & Kustom

Universal seat risers are adjustable in both height and angle. These seat risers will accommodate bolt spacing between 7" and 14". Each bracket is powder coated black and includes all the necessary assembly hardware. Precision laser cut and available in two sizes: 2" tall and 4" tall. 1 pair is needed per seat.
The SR200 is adjustable from 2" to 3" in height.
The SR400 is adjustable from 4" to 7.5" in height.