This kit is the ultimate bulkhead reinforcement kit for the 2017 Gen 4 Ski Doo. This kit reinforces all the a arm mounting locations to the cast aluminum bulkhead. All braces in the kit are zinc plated steel. Comes with all necessary hardware and detailed installation instructions. Works with a skid plate.Includes:-S-Mod Brace-E-Mod Brace&-Bulkhead Bracing Kit