GS850 1979-1986. GS1000 1978-1981. GSX750 & Katana 1980-1983. GSX1000 Katana 1982. GSX1100 & Katana 1980-1987. You are buying a single Downpipe Header exhaust gasket. If you need more than one which most bikes have then change the quantity above to as many as you want maybe 1 or maybe 4 or even more for spares.
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