Manufactured by Includes 2 compression rings as pictured (enough for 1 piston) Manufactured to OEM specifications Interchangeable with OEM parts Rings are for standard bore size 72.00mm Compatible with Polaris models below: 1985 Trail 500 1986 Trail 500 1986 Trail 500 SP 1987 Trail 500 1987 Trail 500 ES 1987 Trail SKS 500 1988 Trail 500 1988 Trail 500 Deluxe 1988 Trail 500 ES 1988 Trail SKS 500 1988 Trail 500 SP 1989 Indy 500 1989 Indy Classic 500 1989 SKS 500 1989 SP 500 1989 Trail 500 1989 Trail 500 Deluxe 1989 Trail 500 ES 1989 Trail SKS 500 1989 Trail 500 SP 1989 Trail 500 Supertrak 1990 500 1990 Classic 500 1990 SKS 500 1990 SP 500 1990 Trail 500 1990 Trail 500 Deluxe 1990 Trail 500 Supertrak 1990 Widetrak 500 Trail 1991 500 1991 Classic 500 1991 SKS 500 1991 SP 500 1991 Trail 500 1991 Trail 500 Deluxe 1991 Trail 500 Supertrak 1991 Widetrak 500 1992 500 1992 Classic 500 1992 SKS 500 1992 SP 500 EFI 1992 SPX 500 1992 Supertrak 500 1992 Trail 500 1992 Trail 500 Deluxe 1992 Widetrak 500 1993 500 EFI 1993 500 EFI SKS 1993 Classic 500 1993 Classic 500 Touring 1993 Trail 500 1993 Trail 500 Deluxe 1993 Widetrak 500 1993 Widetrak 500 GT 1994 500 EFI 1994 500 EFI SKS 1994 Classic 500 1994 Classic 500 Touring 1994 Trail 500 1994 Trail 500 Deluxe 1994 Widetrak 500 GT 1994 Widetrak 500 LX 1995 500 Carb 1995 500 EFI 1995 500 EFI SKS 1995 Classic 500 1995 SKS 500 1995 Trail 500 1995 Trail 500 Deluxe 1995 Widetrak 500 GT 1995 Widetrak 500 LX 1996 500 Carb 1996 500 Carb RMK 1996 500 EFI 1996 500 EFI RMK 1996 500 EFI SKS 1996 Classic 500 1996 Classic 500 Touring 1996 SKS 500 Carb 1996 Trail 500 1996 Trail 500 Touring 1996 Widetrak 500 GT 1996 Widetrak 500 LX 1997 500 EFI 1997 Classic 500 1997 Indy 500 1997 SKS 500 1997 Super Sport 500 1997 Trail 500