Hiro, I think you might be right. I’ve discovered the part number to be 17380-63010.
Looking online I found attached diagram. Link here.
What isn’t clear is how the parts highlighted in green on the rod connect to the valves. Visibility is impossible underneath the rod. See photo attached from the top.
But I guess the main question is, do I bother replacing the actuator (which is expensive) or can I just seal up the diaphragm relief hole (presumably meaning the actuator will no longer move the rod)?
If it’s just for better swirl/vaporization at idle, does it really matter?
Thanks.