Alternators fit 1971-86 GM applications that require internally regulated units. Offered in chrome-plated or polished aluminum finishes, alternators are available in 80 or 100-Amp versions. Single-wire models require just one wire for proper hook-up. Alternators are offered with choice of V-belt or serpentine pulley. Alternator - Factory Cast PLUS - 100 amps - 12V - 1-Wire - Single V-Belt Pulley - Aluminum Case - Natural - GM - Sold as Each - Brand: Tuff-Stuff - Part Number: 7127D Specifications Brand Tuff-Stuff Part Number 7127D Product Line Factory Cast PLUS Voltage 12V Amp Rating 100 Amp Internal/External Regulator Internal Wiring Connection OEM | 1-Wire Pulley Included Yes Pulley Style V-Belt Pulley Grooves Single Groove Pulley Material Steel Pulley Color Cadmium Pulley Finish Plated Case Material Aluminum Case Color Natural Case Finish Natural Quantity Each