John Deere Original V-Belt - M169486. This fits 54 inch models X380, X390, X570, X580, and X584. This also fits 48 inch and 54 inch model X590. This is a genuine John Deere Part. Thanks for looking! John Deere Original V-Belt - M169486. This fits 54 inch models X380, X390, X570, X580, and X584. This also fits 48 inch and 54 inch model X590. This is a genuine John Deere Part. Thanks for looking!