I didn't think this would go in the new products, as this isn't really about new products, but about something i have found useful in the past, although they do sell wheel spacers and wheel adapters. The big thing i like about their site though, is they have a wheel bolt pattern database, that is quite extensive. If you go to their website, http://www.roadkillcustoms.com/ and look on either the right or left side of the home page, you will see a link to their bolt pattern database.
The reason i find it useful is because i can go to it, put in any make and model, and not only does it show the factory bolt pattern, but on most makes it shows offset, as well as the diameter of the wheel's center hole, and the diameter and thread pitch of the lug studs, and if you scroll down past the adapters on the page that comes up, it will also show what other vehicles, even of different makes, that will match your vehicle.
For example, my friend had a 2000 chrysler cirrus. He didn't like the look of the factory wheels, so we went to a u-pull yard, found a set of VW wheels that matched his car that he liked, checked roadkill customs to confirm the fit, so he bought these wheels and they bolted right up and fit nicely. Another place it is very useful, is say you go to your local wrecking yard, or u-pull yard, and see a set of wheels that you would like on your vehicle. Instead of buying them, finding out they wont fit your vehicle, and going through the hassle of a return, you can get on the roadkill website, and find out instantly if they will fit your vehicle or not.