Hello from Brisbane.
The 2.5 litre motor, as noted, is relatively rare in Australia but is quite common in the UK, Europe and parts of Africa where they were used in the original County etc. The S3s were still being assembled here for about 18 months after production ceased in the UK, and most of the Australian trucks were using the Isuzu four or 2.6 litre six at that time.
On the whole they are a very good motor and you see a lot of old Countys, especially in Africa, still doing sterling service despite huge mileages.
I have scavenged a few bits off wrecks in Zimbabwe for my 2.25l motor - e.g. spin-off oil filter adapter and blanking plate off the block for the mechanical fuel pump - the 2.5 litre has an electric fuel pump.
Cheers,

