PROFORM's 120 AMP Alternator is a 1-wire, GM 10 SI Case Style complete with Internal Regulator. The External Fan Style Alternator features a Machined Pulley, Chrome Finish with the iconic Red Chevy Bowtie Logo. This is NOT made with re-man componets. Each alternator is produced by highly specialized machines, assembled by highly trained personnel using dedicated jigs and equipment - 100% New. Sold individually.