This rectifier/regulator is designed to fit specific Onan models, including 191-2106, 191-2208, and 191-2227. Please review all product information carefully to ensure compatibility with your unit before purchasing. It is important to verify that this part matches your equipment's specifications, as incorrect selection may require a return. We recommend consulting your unit's model, serial number, or other identifying details to confirm suitability. If you are uncertain whether this product is appropriate for your application, please contact us with relevant information such as model, code, or serial number for assistance. Our goal is to provide clear and accurate product details to help you make an informed decision. For any product issues or questions, feel free to send a message, including the product title, and we will assist you accordingly.