Red Hat 9.0 is end of life. Unless someone other than RH has produced a 64-bit version, you will not find it.
Mandriva downloads are available through the download links on their website.
SuSE 9.0, IIRC, has never had a 64-bit version. You could check http://iso.linuxquestions.org/
to see if there are any later versions available for download.