The Osram LEDriving SL PY21W (7507DYP-02B) is an LED replacement for conventional PY21W lamps and can be used in various vehicles that have this base. However, it should be noted that this lamp does not have ECE approval and is therefore not suitable for use on public roads.
To ensure that the bulb fits your 2008 Fiat 500, you should check whether your vehicle uses PY21W bulbs. If so, then the Osram LEDriving SL PY21W (7507DYP-02B) is technically compatible, but only for use outside public roads. It is advisable to speak to your local dealer or a specialist before purchasing to ensure that the lamp meets the specific requirements of your vehicle.
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Yup, these are approved for road traffic.
Basically, the colour of the LEDs is decisive. Green or blue is not possible. But white is no problem at all.
Galaxus declares replacement lamps with a corresponding note if they are not approved.