I can't get anything on your photo site. But that's probably my fault...Maybe you can put some photos here on "The Wire",,,I can't tell you how to do it though( I'm a neanderthal).
I was under the impression that yours is a Gen 1 2.6 4cly, (fuel injected?) with rear leaf springs.
It probably has a rear axle from what is sold here as an early 97-99 Montero Sport. The Montero Sport over here is a totally different frame and body from a Gen 2,,,but the rear axles are the same width as Gen 2s. The difference in the USA is all our Gen2s have coil rear springs and M. Sports had leaf springs from 97-99 and coils 2000 -2004. Some M.Sports had drum rear brakes , some disc. All Gen 2s had rear disc.
One way to tell for sure if the previous owner put a wider/ later model axle is to measure the distance from the spring mount pad on the axle to the end of the axle housing at the brake backing plate and compare that measurement to a stock montero. That's were the extra length will show up as the frames are same width at that point on the Gen 1 and Gen 2.

Of coarse, every continent got different setups <img src="/forums/images/graemlins/confused.gif" alt="" /> and same units are even a different year model. Other countrys have got factory optional equipment and accessories that we can't even special order over here <img src="/forums/images/graemlins/frown.gif" alt="" />.
I like to see the different setups you get on your side of the Pacific.