I reported them to ebay a couple of weeks ago...didn't seem to help.
I have started searching by using the following search term: Amphicar (-(fits amphicar)) to try to wade through the junk.
I wish ebay had a way to remove these sellers from my search.
Reporting them to eBay is like spitting into the wind. There is a guy who has stripper dolls which show up under "Porsche 914 NOS -fits". I have reported his listings dozens of times to no avail. As long as they pay their listing fees, ebay really could care less.
I suppose that if enough people fill the sellers email with "questions" they may be compelled to clean up their spam listings. I am happy to help out in that regard!
If you go to the forum home page you will find that I have added an RSS feed of current, amphicar related, eBay listings. I have set up filters to hopefully eliminate the shop rags, led lights, dozens of hotwheels cars, and plymouth parts. Direct link is here. http://amphicar770.com/forums/ebay-amphicar-related-ads-rss.15/