The listing is for a Bracket Kit that contains 6 pieces to build the own wooden side extensions and use more space on the trailer. Each bracket is designed to slide into each dump side pocket just like the side extension "legs" would. 

The Kit Can be used on 10ft, 12ft, 14ft, 16ft, & 20 dump trailers.

These do not fit on the GZ and DZ models. 

The Kit includes :

(1) - Right, front corner bracket
(1) - Right, center bracket
(1) - Right, rear bracket
(1) - Left, front corner bracket
(1) - Left, center bracket
(1) - Left, rear bracket

This kit does not include lumber or hardware**

Recommended hardware to use:

(44) 3/8" x 3-1/2" Hex Head bolts - Part # 100326
(44) 3/8" Nut, Nylon Insert - Part # 100117
(88) 3/8" Washers

Note:  The parts might come with scratches originally from the manufacturer.