Motorola V551 / V330 / V547 / V555 / V557

I recently left Sprint for Cingular and got a motorola v551 phone. I currently belong to a download site called 3gwiz.com and like it very much. I was able to download great ringers to my old samsung v1000 without any problem. When I went to download the ringtones to my new phone, it said the .qcp file format and mp3 format are not supported for my phone. Does anyone know what to do about this? I e-mailed the site for tech support, but so far I am still waiting.