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Hi guyguy, To make sure you get the correct replacement blade, we recommend checking the mower’s operator manual or reaching out to Greenworks Customer Support with the model number from your mower. Blade fitment can vary between 21" mower models, including refurbished units and dual-port configurations. Using the correct blade size and mounting style is important for proper performance and safe operation. Greenworks Customer Support can be reached at 1-888-909-6757 or through Live Chat, and we’ll be happy to help confirm the correct replacement blade for your mower.
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