Some cars had the Dip Switch mounted on the body close to the window catch area when the window is closed. This Lucas 9RW Part No 31704 later changed to Part No 31291 and is very difficult to find now. Some switch's maybe be supplied with "ON" engraved on the cover, the Isetta did not have "ON" so if you wish to be original we suggest you fill in the enraving and repaint it.