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Fit for GY6 GMB139 Engine 50cc 70cc 90cc 110cc 125cc 150cc Scooters ATVs Go Karts Moped Quad 4 Wheeler Dune Buggy, Chinese Scooters with GY6 50cc - 150cc Motors Sandrail Taotao Sunl Coolster Jonway Roketa etc. Exhaust Studs: 35mm/1.38inch Long, 5.7mm/0.22inch Thread M6. Nuts/Caps: 32mm Long/1.26inch, 5.1mm/0.2inch Thread M6. Bronze Gasket: Outside Diameter 30mm/1.18inch, Inside Diameter 21.7mm/0.85inch, 4.3mm/0.17inch Thickness. Extra gasket: 49mm, Inner port: 27 mm, Double Sided, Double layer Extra Thick!