It still requires that you have a compatible body - i.e. one with a serial number below about 11000. After that they stopped drilling the hole through the bottom of the body to join the solenoid feed to the valve chamber. If there is a small grub screw on the bottom of your body to the left of the ASA hole (as you hold the body, looking at the underside, barrel end upwards) then your body is compatible. Otherwise, it won't fit.
The difference between the ND VFF and the Voodoo (for instance) is that it comes with a specially-made airscrew which installs in place of that grub screw, but removes the need to tap the hole between the solenoid tube and valve chamber.