It's best to always quote the numbers as I have done above. The first part identifies the actual part. The second part identifies the model or, more importantaly, the model for which the part was orignally developed. The last part is the revision level (normally) and you have to be careful as Honda changed the design, size or shape from time to time. Sometimes the change didn't really have an effect and somethimes they changed the part without updating the number. Such is life, even in Japan..... :-)
Good luck!
G
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1965 Honda CP77 — Ulsan Metro City, Rep. Korea
Restored with original parts — Owner: J. Doe