R&G engine case slider was designed to fit the right hand side (RHS) case cover. Left hand case slider also available here: ECS0035BL Crafted from High Density Nylon for strength, durability and good looks. They compliment the R&G crash protectors perfectly. The covers simply bolt on over the original engine casing. Slimline for maximum ground clearance, ultra lightweight, matte finish and protecting one of the most vulnerable parts of the machine.