Internet information regarding these figures is limited. The photo below I got from a post that Mr Cairns posted on Figure Planet here:
There is additional information regarding these figures posted in the Historicus Forma section of Armorama.
AC Models, in conjunction with their release of their New Zealand SF HMMWV crew, has also released a New Zealand SF HMMWV conversion set. Based on the photos below, it appears the conversion is intended to be used with the Tamiya M1025 Armament Carrier or the Tamiya M1046 TOW Missile System Carrier.
The images below were pulled from Google....I'm not sure where they originated from. My best guess is that they might have originated from a 'News' story on Armorama.