The turn signals can be mounted independently at any point and are legal thanks to E-number. But so that the turn signals may be used legally the specifications must be observed during installation..
In the rear, the turn signals must maintain a minimum horizontal distance rear of 18cm and front of 24cm, furthermore, one must be able to see the flashing signal from the opposite side (20 degrees).
If the turn signal frequency is too high after installation, an resistor cable is also required. The turn signals are 5.35cm wide, 0.7cm high and 1.5cm in depth.