2017 BMW 550 Gran Turismo Bulb Size

Misconception: people often think any "bright" bulb or universal fit will work for a 2017 BMW 550i GT. It seems true because many bulbs look the same and packaging promises compatibility, so swapping one feels simple. Think of it as assuming all plugs are identical when they're not. What is true is that the 2017 BMW 550i GT uses specific sizes and types for low beam, high beam, fog, and signal bulbs, and the chart here lists those exact fits so you can match sockets and electrical needs. The mental model to use is match size and type, not just wattage. Implications: using the right bulb avoids flicker, poor beam pattern, or errors on the dash. Quick tests: compare the chart entry to the bulb removed and test polarity for LED swaps. Quick recap and disclosure: this page includes affiliate links, which may earn me a small commission at no extra cost to you. I link to trusted sellers to save you time, and the recommendations are based on experience fitting bulbs into BMW models.