[libvirt-users] Virt-io Kernels for older RHEL/CentOS versions

All, I need to run a number of guests which user older distributions of RHEL and CentOS on an RHEL 6.3 host. The versions are; 4.8 - i386 5.1 - i386 5.2 - x86_64 5.3 - i386 Currently I am running these with the E1000 network driver and the IDE driver. Where can I find kernels (or modules) for virtio for these OS's ? Thanks in advance Chandana