this is what I did when I got ripped off by redlinepowerchip on ebay.
I disputed claim on paypal and emailed the guy and told him what I thought of him and his product.
later, he emailed me from another email address acting like a previous customer, well, he was dumb enough to use the name of his other ebay account that be bought stuff with. After reading his feedback, I found someone whom he had ripped off and contacted him. I was able to get his real name, address, and phone number.
I confimed this by finding a business liscence in the same city. Also found other domains and businesses he had started.
Sending a screen shot from Google Earth of his apartment with a bullseye painted on it resulted in him moving
He no longer lists his crap for my particular car
unfortunately, he still sells his crap to other unsuspecting car owers on ebay