If New Zealand reacts like they did when they ordered the Pinzgauers, you’ll be looking at releases in 2035.

The Land Rover fleet that the Pinzgauer replaced was over 30 years old at the time of the Pinzgauer contract. And in this case, the new Supacats are an armoured up vehicles and make even a SBU Unimog look small, In fact, other than a little narrower, the lengths are about the same as the US FMTVs, either the 4x4 or 6x6 models. Roughly speaking, the 4x4 Supacat Extenda (or Jackal) is 20% longer than a Pinz 718 and a whole lot heavier. I wouldn’t expect NZ to scrap the Pinzgauer fleet because it not up to the role of a MRAP but to delegate them to other duties they are better equipped for.
As for an Isuzu in a gas Pinz, you need a redline of 4500 to make it roadable or replace the trans with one to have an overdrive and a short tailpiece to allow for the short cordon shaft. The 716 and 718s have a longer wheelbase of 8” over their gas counterparts. Even a TD with the longer auto trans, the cordon shaft is still almost 2” longer than the ones in a 710/712 with a manual trans.
As some general numbers, total Austrian made TDs was under 6000 (LHD and RHD), and the number of UK made soft skin Pinzgauer was 1029 , and 181 Vectors. And almost all the UK made Pinzes are RHD.
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The Trojan Horse... the 1st Pinz used to covertly carry troops into battle .
ATL Pinzgauer XM 718K TUM(HD) 6x6 FFR (aka The Green Grail)