Mikuni 48MM RUBBER FLANGE HS42/062-48 Rubber Flange, 48mm black (w/clamp) HS42/062-48 Adapts spigot- (sleeve) mount carbs to flange-mount manifolds Clamp included 8.5MM Bolt Hole - 70-78 Carb Bore Size - 48 Carb Spigot Dia. - 51