Fits Zundapp, Kreidler, Sachs and Puch speed wind cooled models with counterclockwise rotation. If you have a fan cooler, you need to modify the flywheel yourself a little to be able to attach the fan.
Our retarder circuit 15325 naturally fits this system.
On Husqvarna flint, a spacer for the generator cover needs to be manufactured.
We have noted that on some single hand-shifted two-speed Sachs, it is tight to get a Kokusan flywheel in. Check that there is about a 7 mm margin outside your old flywheel if you want to be absolutely sure that it fits. All others fit it perfectly as far as we know.
If you want 12V, you buy the voltage regulator, e.g. with Article 14589