Balmar Alternator 170AMP 12V Vortec Mount K6 Pulley w/Internal Regulator & Isolated Grounding One Size. Balmar installs high reliability bearings robust rectifier diodes and improved heat-sinking capabilities on all our alternators to ensure improved system reliability combined with increased charging power.Features:Vortec Internal Reg K6 Serpentine Pulley170A12VInternal RegulatorIsolated GroundingThis product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns. Package Contents: Balmar Alternator 170AMP 12V Vortec Mount K6 Pulley w/Internal Regulator & Isolated Grounding Balmar XT-VT-170-IR-IG: Alternator 170AMP 12V Vortec Mount K6 Pulley w/Internal Regulator & Isolated Grounding One Size