To have an nfs client, means you want to be able to mount nfs shared drives from a server somewhere. For that, you need mount.nfs - usually /sbin/mount.nfs.
On my Red Hat 5.x system here which I think might have been based around Fedora8 timeframe, that is available from the package nfs-utils.
I am suprised that you don't have mount.nfs already installed. However, if you have access to yum, you can just type `yum whatprovides */mount.nfs` and it will tell you what package has that.