This single o-ring is suitable for Mutoh Blizzard printers. This is the original Mutoh part (number KY-42128). This o-ring has an inner diameter of 3mm and an outer diameter of 5.5mm.
 
Printer compatibility
Mutoh Blizzard 65
Mutoh Blizzard 90
Mutoh RJ-8000-50 (Falcon II)
Mutoh RJ-8000-64 (Falcon II)
Mutoh RJ-8000-87 (Falcon II)
Mutoh Rockhopper 3 65
Mutoh Rockhopper 3 90
Mutoh Rockhopper 3 Extreme 65
Mutoh Rockhopper 3 Extreme 90
Mutoh Rockhopper II 50
Mutoh Rockhopper II 64
Mutoh Rockhopper II 87
Mutoh Rockhopper II-2H
Mutoh Rockhopper II-4H
Mutoh Spitfire 100 Extreme
Mutoh Spitfire 65
Mutoh Spitfire 90
Mutoh Viper 100
Mutoh Viper 100 TX Extreme
Mutoh Viper 65
Mutoh Viper 90
Mutoh Viper Extreme 65
Mutoh Viper Extreme 90
Mutoh Viper TX 65
Mutoh Viper TX 90
Mutoh Viper TX Extreme 65
Mutoh Viper TX Extreme 90