Idle Stabilizer Control Unit for 80-85 Vanagon 2.0l Air-Cooled and 1.9l Waterboxer Vanagon. This is the green one that was used on all 83.5-85 waterboxer Vanagon. For the Air Cooled Vanagon, this was used on the California version (electronic ignition). If you have the federal version (points ignition), then you need the black version of this. The part number is 321906083 for the black one.