Do a lot of research - I did and ended up getting recon ones from Mid Coast Diesel in Taree. I had organised to get mine reconditioned there for about $120 each but the next day he rang to say he had a set for me. A guy had come in to get his injectors done and even though he was told the problem was a cracked head he still wanted them done. Drove about 500m up the road and the engine blew. I got them for $70 each
There are quite a few Youtube videos on replacing them - just make sure you have got the one for a Prado 120 with the correct engine bay layout.
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