This listing is for the pictured Regulator/Rectifier removed from a 2015 DUCATI MONSTER 821 Petrol with an engine code of and 54040321A miles. Please make sure the part number is correct for your vehicle before buying. The Regulator/Rectifier were tested upon removal and comes with a 90 day guarantee. If you are unsure about fitment to your vehicle please message us through ebay.