When you mount a Chevy alternator to a Holden engine its close but not quite right. Aeroflow have developed a spacer kit to get the fitment and belt alignment perfect. This adapter kit allows the use of Aeroflow Chev 100, 120 and 140 AMP alternators to be mounted to any Holden V8 and even the Holden 6 Cylinder, fitted with a Bosch alternator.