I don't make or modify air cleaner lids ,it's quicker and easier just to remove an air cleaner assembly from a dead engine and fit that air filter assembly to the good engine that is missing the lid ,I just sold 25 serviced & repaired mowers and a lot of them were fitted with filter assemblies from other mowers, the carby stud spacing was the same, the air cleaner assembly from a Sanli Lawn Beetle will fit other mowers and I had a heap of dead Beetles.