ACDelco Gold (Professional) 90 Degree Molded Accessory Drive Belt Tensioner Assemblies are the high quality alternative to Original Equipment (OE) parts. These 90 degree molded belt tensioner assemblies are very important in optimal operation of the accessory belt drive system. The tensioner maintains the correct amount of tension on the belt throughout operation. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional.