Now you can search eBay for parts with the model number and a part description. This may not sound revolutionary, but try it out. You'll be surprised how quick and convenient it is.
I have a menu of every Honda model and suggested search terms that get the most results, but you can also use your own. I've also done some filtering so that you won't see results for Honda cars.
Tip1: When selecting words to search don't use plurals like "side covers" or "brakes", this will limit your search to only the listings that use the plurals. You'll get a lot more hits if you use "side cover" and "brake" instead.
Tip2: After you create the search you want, save the page to your favorites and you can run the same search every couple of days to find that elusive part.