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The Double-Groove GM Steel Alternator Pulley is engineered around the manufacturer's application-specific specifications. Double-groove GM steel alternator pulley 140 Amp LT1 TypeBuilt by Tuff Stuff. CS130 series (late 80s - early 90s Chevy V8 engines) fit all Vintage Air Front Runner systems and Vintage Air's ProLine compressor and alternator brackets. Polished chromed or standard finish. (Will not fit Steel-eez or standard steel brackets).