Callus roms seem to be pretty easy to locate on the internet to download. I have found a few websites that you may want to check out. Here is one of them: http://www.doperoms.com/roms/Callus.html. Here is another link to a website that goes into more detail about callus roms: http://roms.zophar.net/.It has troubleshooting and more examples of issues you may have.
