The USA Model Guide continued ....
When trying to locate parts, a very useful tool is a Honda part number cross reference. As an example: You need a disc brake rotor for a CB750 K2 and you have the Honda part number: 45120-341-000
Go to Motogrid:
http://www.motogrid.com/pages/parts/viewbybrand/7/honda.aspx Using the Motogrid "quick parts look" box, enter the brand and part number. (you don't need to enter the model) The results will show all the other Honda models that used the same part number and the new superseded number (if applicable)
This cross reference is designed around the USA models. If you need a UK model specific part such as a number plate bracket: 84701-323-600B, unfortunately this cross reference will not work for you.