P13W bulb

Will P13W lamp fit into the lighting system of my car? Actually, this is a great question to ask as P13W has specific base matching only the vehicles with the same fitting. According, to ECE Regulation No. 37 automotive light bulbs are classified into three major groups:

• Group 1 - does not imply any restrictions and lamps of this group can be installed on any part of the vehicle. 
• Group 2 - these light bulbs are only allowed to be used in signalling, cornering, reversing lamps and rear license plate lamps.
• Group 3 - lamps are only good for replacement.