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Geeves, I think that he means the wax type cold start device (or similar) that alters the Injection Pump timing under certain conditions. From memory some of the instructions for timing belt replacement mention removing or disabling this device when re-timing the Injector pump.

Brinky, good information for others in the future.

Have you been to an Isuzu dealer and asked? It's sometimes surprising what they can still get.
I'm pretty sure that I gave them the numbers in the parts diagram above the last time I got any.
They may have an updated part number now though.

This is the actual Isuzu part number if that helps.
Rear Diff - 01.jpg
Rear Diff - 02.jpg

It looks like there is a couple of versions of the Wizard knuckle also.
I don't know what the differences are.
Wizard - 04.jpg
Wizard - 05.jpg

Here are some parts book numbers for the Mu lower suspension arm and lower outer ball joint.<br/><!-- ia6 -->Mu - 01.jpg<!-- ia6 --><br/><!-- ia5 -->Mu - 02.jpg<!-- ia5 --><br/><!-- ia4 -->Mu - 03.jpg<!-- ia4 --><br/><!-- ia3 -->Mu - 04.jpg<!-- ia3 --><br/><br/>Here are some parts book numbers for ...

I'd try some auto electricians or the Isuzu dealer. Maybe a Holden dealer if one still exists locally.

Here are some part numbers for the most likely alternators fitted to your Mu.
This may help you locate the correct brushes.

This information is for a Mu put is probably the same as a Bighorn in this area.

Isn't a lot of stuff in Isuzu's negatively switched? Sort of back to front to most other cars.