Boyesen Power Reeds use a patented dual-stage fiberglass design for more airflow, more air velocity and more overall power. This item fits the following applications: 1986-2004 Kawasaki KX500, 1991 Husqvarna WXE 260, 1987-1988 Kawasaki KXF250 Tecate 4, 1983-1988 Kawasaki KX250, 1984-1987 Kawasaki KXT25 Tecate, 1987 Suzuki LT500R QuadRacer, 1987 Suzuki LT250R QuadRacer, 1981-1986 Suzuki RM250, 1983-1984 Suzuki RM500, 1981-1982 Suzuki RM465.