One of the hardest parts of our jobs serving you is looking up parts. Every manufacturer has many different part numbers, model and serial numbers that effect what part you are looking for. Many times the manufacturer will change the design mid year and not change the model number, making it impossible for us to give you the right part unless we also have your serial number. A lot of our customers think that all parts are the same across models and this is just not the case. Air filters, oil filters, spark plugs are just a few examples of parts that may be different depending on the serial number of a model. If you purchased the unit in our store we will have the model and serial number in our system. To be safe it is always a good practice to take a picture of your model and serial number before you come in or call for parts. In the case of riding mowers, zero turns and tractors you should also take a picture of the engine numbers. Thanks!