RVM - small wheel company based in Garden City, NY. Has three dealers in the New York area, 2 in the Bronx.
Seems like a small wheel company and a large portion of their wheels look real ugly (http://www.rvmwheels.com/wheels.php
Theres a contact part of their website so you could try calling them and asking about some sort of warranty.
otherwise, tsw sells a rather similiar style (actually i like the tsw look better) called the zandvoort. It has an 18x8 sizing and a 5 lug pattern available with an offset of +20 to +45mm. So should definitely fit. You could then get it powdercoated to be glossy black. Of course this is getting up there in price but TSW is really good quality from my experience.