Ebay is just like the rest of them, you have to know what you are buying, ask questions. Actually Craigslist is worse to me. I run a search on ebay occasionally like this:

(crossfire -arctic -tank -boot -goggles)

I found putting in Chrysler restricts some of your results. If someone lists a Mercedes part, knowing it fits a Crossfire, a lot of times they won't include Chrysler in the subject line.

From there you can use the left sidebar to seperate the cars from parts, manuals, apparel, paintball stuff, etc...