Have you used the Common Motor light? Was it an perfect swap?? Perhaps I will try that and get it with the LED.If you want a brighter headlight or need to replace a burned out one.
the Honda CB350 / CB450 K1 - K4 Headlight Lens & H4 Bulb Kit | Common Motor Collective
Common Motor collective unit above is the ONLY way to go.
But tell them you are mounting it in the 350/450.
The do need to do a simple mod for the side to side adjustment.