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Edelbrock 15873
3.25" 8-Rib E-Force S/C Pulley in Black Finish for Stage 3 - Pro Tuner System; Edelbrock 3.25in. part #15873 pulley allows you to fine tune the airflow and performance of your Edelbrock Supercharger System to your preference.
Edelbrock 15879
E-Force 8-Rib Belt Drive Upgrade Kit for Ford Coyote 5.0L Engines; For use with Edelbrock equipped 2013-20 5.0L Mustangs. Enables the use of a wider, 8-Rib supercharger pulley. Increase boost and will help eliminate belt slip prone to 6-Rib configurations. Use with 2.625in. - 3.75in. pulleys.