Genuine OEM (Pack of 4) Champion Spark Plugs for Gravely 21525900, 21531100, 21534100 Engine Specs - Refer to images 2 & 3 for more information Includes - (4) Spark Plugs; comes as shown in the first image Please be sure to check your part or model number to ensure this is the correct spark plug for your unit. Also, please note this may replace multiple parts numbers Fit type: Vehicle Specific (Pack of 4) Champion Spark Plugs for Gravely 21525900, 21531100, 21534100 Engine. Please review all product information to ensure that this product is compatible with your unit.This is a Quality Champion Brand ProductA Message to the CustomerThe ROP Shop staff constantly strives to provide clear and concise product information. We understand that sometimes it can be difficult to confirm the exact product needed. It is your responsibility to confirm this is the correct product you require; therefore, we encourage all customers to fully review the information provided in this listing prior to purchase. Be sure to review photos, specifications, and bullet points closely to verify this is the correct product for you. Nothing is worse than having to return a product, trust us we get it. Let’s work together to avoid this! If you are unsure as to whether or not this is the correct product you are looking for, please ask. If you seek assistance we will need as much information as possible to help you find the product you are looking for.Our knowledgeable product specialists are always willing to help ensure that you’re getting the correct product. Stay rugged, my friend.- The ROP Shop Staff