Motorcycle Seal For Honda ST1100 CTX1300 CB1000R ATC250SX Work for Fit For Honda ST1100 1991-1994 CTX1300 2014 CB1000R 2016 ATC250SX 1985-1987 header pipe connecting assembly with 43mm size Align port outline mounting holes; support direct installation without or extra auxiliary fittings Block leakage reduce noise; stabilize flow during highway offroad riding Adopt temperature composite material with flat smooth sealing surface Made to standard 43mm outer dimension specs; closely fit flange to avoid leak gaps