The nf_conntrack_ftp module exists in the /lib/modules directory:
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[root@cp ~]# find /lib/modules/ -name 'nf*' | grep ftp
/lib/modules/2.6.32-696.16.1.el6.x86_64.debug/kernel/net/netfilter/nf_conntrack_ftp.ko
/lib/modules/2.6.32-696.16.1.el6.x86_64.debug/kernel/net/netfilter/nf_conntrack_tftp.ko
/lib/modules/2.6.32-696.16.1.el6.x86_64.debug/kernel/net/ipv4/netfilter/nf_nat_ftp.ko
/lib/modules/2.6.32-696.16.1.el6.x86_64.debug/kernel/net/ipv4/netfilter/nf_nat_tftp.ko
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[root@cp ~]# ls -l /sys/module/ | grep nf_conntrack
drwxr-xr-x 3 root root 0 Dec 29 16:18 nf_conntrack
drwxr-xr-x 3 root root 0 Dec 29 16:18 nf_conntrack_amanda
drwxr-xr-x 3 root root 0 Dec 29 16:18 nf_conntrack_ftp
drwxr-xr-x 3 root root 0 Dec 29 16:18 nf_conntrack_h323
drwxr-xr-x 3 root root 0 Dec 29 16:18 nf_conntrack_ipv4
drwxr-xr-x 3 root root 0 Dec 29 16:18 nf_conntrack_irc
drwxr-xr-x 3 root root 0 Dec 29 16:18 nf_conntrack_netbios_ns
drwxr-xr-x 3 root root 0 Dec 29 16:18 nf_conntrack_sip
drwxr-xr-x 3 root root 0 Dec 29 16:18 nf_conntrack_snmp
drwxr-xr-x 3 root root 0 Dec 29 16:18 nf_conntrack_tftp
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[root@cp ~]# modprobe nf_conntrack_ftp
FATAL: Module nf_conntrack_ftp not found.
TIA!