HONDA produced two types of CB550 models: the CB550f and the CB550K3. The CB550f was known for the 4 into 1 exhaust on the right hand side. The CB550K3 was provided with the classic 4 into 4 exhaust. The CB550K3 model would have the choke-control on the dashboard, whilst the F models were operated on the carbs using a lever.
Klick on the model you have to find the correct parts.