http://mirrors.manchester.icecolo.com/centos/5.8/isos/x86_64/CentOS-5.8-x86_64-netinstall.iso
http://mirror.rmg.io/centos/5.8/isos/i386/CentOS-5.8-i386-netinstall.iso
Web site name:
mirror.centos.org
CentOS directory for i386:
/centos/5/os/i386
or
/centos/5.8/os/i386
CentOS directory for x86_64:
/centos/5/os/x86_64
or
/centos/5.8/os/x86_64