You must remember we may be thousands of miles away from your location, without a strong drink in hand to see your exact unit. We can only base our replies on the info and pictures you post. Even as experienced techs at this point we can only make guesses at this point. Star guessed a SW30 model and I guessed an SW20, I think one of us is correct, but remember they are only guesses. Most Snapper units have a silver ID tag riveted to the frame, somewhere around the handle area. If you really want help us help you, you must work with us. The manual I posted has two different models, depending on the engine HP. Please take a third look at your unit and see if you can find any silver ID tags. If you post back and can’t find a unit ID tag, include all engine numbers and an exact width of the deck and we’ll try to help you by using a couple or backdoor methods.