I went to the dealer and gave them my VIN and got a print out online of the cars specification and all options which were ordered.
That is why I know the option for the buffalo leather.

As I said, I have no knowledge about leather treatment. Ask the experts. If you do not know the leather type and color, the cut off a small piece of the original color (from under the rear seat is best) and send it to them. Then they know exactly what you have and what the color is.
My friend in Germany asked me for the same sample.
He said for the black leather seats of my dolphin grey Highline he does not need a sample, but for any other color and leather type.

In Germany most of the people with older cars or oldtimers order from Lederzentrum, they are said to be very good. They have also an agent/distributor in New Zealand but not in AUS. Here is something from their website about leather care.
http://www.lederzentrum.de/international.html

So what I got is this:
Friction damages and fading (mostly driver seat) can be renewed with our Leather Fresh. The colour of the leather will be restored and the original protection coat will be renewed.
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The NZ page
http://www.leathertec.co.nz/index.htm