I've never found out the truth about the brakes on the Jets. I was told by a Jeep dealer that the 17" wouldn't fit. I got my 18" from a Bob Jane dealer. He looked them up and also said that they were listed at 18" only. But i have also heard others say the 17" fit.
In the end I went with the 18" because many/most Prados etc run the same size and finding tyres is much easier. (I had a tyre blow on the original Jet 20". It was in small country town and they had nothing even close to a spare 20"). So I would look at tyre availability as well as rim size.
bruce
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2012 3.7. KK Jet.
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