THIS WILL ALLOW THE BIGGER CARBS TO CLEAR THE CYLINDER WHEN USING THE 18,20 OR 25MM CARBS AND THE SHORT 22MM MANIFOLD , ALSO HELPS GET THE CARB AWAY FROM THE CYLINDER HEAT. THIS IS 10MM THICK , THE CENTER HOLE IS 22MM AND CENTER TO CENTER ON BOLTS ARE 44MM. 300028 @ *GASKET INTAKE_TO_HEAD CT70KO_to_1977 ALL_SL/XL70'S (all_CT110's) (CT200?)7/20M (31B) THIS GOES CLOSEST TO THE HEAD ON THE INTAKE SIDE. FITS KO THRU 1977. and all atc70's 22MM CENTER 44MM BOLT PATTERN ALL HOLES ARE CENTERED all SL AND XL70'S TAKE 2 ONE ON BOTH SIDES OF THE INSOLATER 31B