Seat Risers have adjustable height, lateral and tilt positions and are easy to install.

They are made of 10 guage steel, come fully-finished, and include the nuts, bolts, and washers as shown in the illustration above. 

Seat risers come in two sizes: 2" extends to 2 1/2", 4" extends to 6 1/2", the overall length is 15", hole spacing at 14".