This supercharger pulley is a high-quality aftermarket part that fits 03-08 Mercedes R230 SL55 S55 CL55 AMG models with M113K engines. It replaces the original part number A1130900044 and is belt-driven. The pulley is designed for enhanced performance and is perfect for those who want to upgrade their engine without compromising quality. This item is not a universal fitment and is not intended for vintage or performance cars. It is a genuine OE OEM original part that comes with a coupling flange and fits Mercedes-Benz / Mercedes Benz / MercedesBenz models including the SL-Class, E Class, and more.