that coil might work but it is not the correct one, as GT550 has pointless ignition.
The coils for breaker and pointless ignitions have different impedance/resistance.
Can’t remember out of my head which is which but ones have approx 2 Ohm, the others have approx 5 Ohm impedance.
No idea what will happen if you use the “wrong” one ?!?
You may look for a coil with dual output (!) from other breaker ignition models. Make and model is equal, maybe some mechanical issue to fix them again.