[CentOS] centos 4.9 + ip6tables

Hi I have an old server running centos 4.9 and recently I added ipv6 connectivity to it, however I wanted to use iptables to restrict access like im doing over ipv4. I tried using yum to install ip6tables but that's not available on the repo. I'm trying to figure out what my options are, how do you guys recommend I go about installing ip6tables. I guess I could upgrade the server from 4.9 to 5.x but I heard this could cause issues with things already installed and I have never done an upgrade like this. This is a server running chroot bind compiled manually. My other option is to use an ACL on the router the server connects to but I really wanted to get ip6tables on there.

Paul