on a n15 you can do it. the local ones here have thin crap brackets that have to be redrilled to work. it slides in and there is no need to do any cutting. the radio sits where the ac controls are on the jap n15 cj2 that you are thinking of. they also use a eurovox radio.( not sure what NZ new use)
which is better than what oz gets. it has brackets and you can use them. the local one is done easier the other way.
n13,n16 are a different matter.