Thanks guys.
I didn't want to change this guy too much, as the figures are great as they are, just loose the Aussie bits, so changing the pack was the main part.
Managed to save his '37 patt pack & entrenching tool. Used the pack from one of the NVA (the one with the NVA helmet on the side;salvaged the helmet), that figure now has a smaller pack and US waterbottles.
The rest of that Aussie pack (ANZ3) have all had the butt packs removed, the toggle ropes removed & the '37 patt ammo pouches cut down. Leg pockets added/modified, some sleeve pockets added & probably get extra waterbottles or other kit added. A couple of NVA figures are getting different belt kit & trouser pockets.
The rough idea is that these, the recon & SOG figures could look the part of a MIKE force unit .