Correct me if I'm wrong, but I recall that you could look up parts on westernhillshonda.net; however, the parts locater would not tell you if the part is actually in stock.
Personally, I use the
Service Honda System. Their system is interactive, and is (as far as I can tell) the same application that the Honda Dealers use. Using their system involves two things I normally abhor (Microsoft Internet Explorer and ActiveX components); however, it is entirely worth it because you can browse catalogs and do cross referencing quite easily.
Some time back, I wrote some quick instructions about how to use it:
Using the Service Honda SystemI'll write a quick FAQ if it would be useful. I use their system whenever I (or someone here) needs to know what years are interchangeable for a given part. It's like nothing else available on the Internet for Honda parts, and I'm kind of surprised that more members don't use it. Mebbe it's not as useful for other folks?
P.S. In terms of interactivity and speed, the Service Honda system blows away other sites with static images of parts fiche.