What I don't understand, is that the complete ignition plate for a CB350F is 30200-333-004. For the CB400F, according to CMSNL you can either have 30200-333-004 or the 30200-323-154. The latter is also on many other CB Fours like the CB500/550s. What is it that the CB400F can have either plates and the CB350F only the 30200-333-004?