Ski Doo Gen 4/5 Assassin HD 154 Rear BumperNOTICE FOR SHORT TUNNEL MODELS ONLY. 146=ORDER 137 BUMPER 154=ORDER 146 BUMPER 165=ORDER 154 BUMPER If you are unsure which bumper you need please add year, make and model in the notes. We have engineered the best GEN4 & GEN5 bumper on the market! Add style, strenght and reliability with our ASSASSIN rear bumper! Made from high quality 3 16 6061 aluminum. Low profile grab bar for the least amount of drag. All grab bars come black in color. MADE IN THE