Feature:1. Applicable Model: The vacuum advance unit is a replacement for Lucas 45D4 and 45D6 distributors, please check the model before ordering.2. Function: Essential item controlling the advance of your ignition timing under acceleration, provide better throttle response and improved driving experience.3. Practical: Boosts power and delivers instant throttle response for engines, provides maximum spark with no harmful pinging or detonation.4. Rigorous Testing: All components are rigorously inspected and meet the strictest quality standards for stable performance and long service life.5. Fine Workmanship: Professional manufactured, exquisite workmanship with unique design, ensure stable performance and high reliability.Specification:Item Type: Vacuum Advance UnitMaterial: Metal.Fitment:Replacement for Lucas 45D4 45D6 DistributorsPackage List:1 xVacuum Advance Unit