Latest Version of cPanel with PHP4 option MultiPHP

I'm currently running the latest version of cpanel. There is one website using outdated proprietary code which required php4. Yes I know this is not ideal and highly not recomended but he is moving from ensim running (super old linux distro) to CentOS 7 w/ latest cpanel. This is 1 client and I was hoping with MultiPHP I can get his site running on php4. However, I dont know where to start to get this under multiphp option to enable a user to have php4 only.