I have an aftermarket spare tire carrier (JCR Adventure Carrier), and just bought new wheels and tires. The new wheels don't sit flush against the spare tire carrier, causing some noise. JCR recommended that I get separate isolators and referred me to Quadratec, but I can't find anything that isn't a replacement for the little rubber bumpers that go on the back door of the Jeep. A google search led me to a slew of sites, but they are all related to specific spare tire carriers. Anyone have any suggestions or ideas?