This is a genuine replacement part, this is the gasket set for the carburettor on Mountfield lawnmowers with the below model of engine RM45 Mountfield HP474 Mountfield SP474 Mountfield 501HP Mountfield S461PD Mountfield S461RPD RM55 Mountfield SP533 Mountfield SP536 Mountfield HW511PD Mountfield S464PD Mountfield AL511PD Mountfield S461PD/ES ST55 Mountfield HW531PD 294556843/M16 Mountfield S461PD 295486043/M16 Mountfield S461RPD 299489043/M16 Mountfield S501RPD 294519043/M16 ST55 Electric Start Mountfield S461RPD/ES 299489543/M12 Mountfield S481PD/ES 294502543/M16 Part Number 118550743/0