Yoshimura RS-12 Spark Arrestor Insert | SA-20-K. Includes ONE Replacement USFS Approved Spark Arrester for RS-12 Off-Road Mufflers.Available as optional Spark Arrester on applications not originally equipped with a Spark ArresterPlease see our Insert Chart to confirm fitment for your applicationKit Includes: 1 x Spark Arrester Insert, 1 x End-cap collar, 1 x Set screw http://cdn.wpsstatic.com/images/full/4a5a-5e5fce3671116.jpg- Yoshimura RS-12 Spark Arrestor Insert | SA-20-K.