Hi
Basically the Pajero uses the roof drain/gutter to provide any hold for roof rack systems.
THULE (Sweden) have roof racks for Pajero. I personally don't prefer this as the clamps tend to scrape the roof siding and scratch it.
My choice is the Sports Rack MONDIAL (Canada), cost about $350/set but comes with 5 dif. sets of clamps for various car roofs (so it highly transferable). You may need to select the proper length for Pajero tho'. (Please see picture).
Installation is easy and it's lockable, with soft rubber pads. The load rating is 75 kilograms, but bear in mind that Pajero roof is rated for a maximum of 100 kgs.
I would recommend the Mondial for its sleek design and reliability (used it for the last 10 years), ease of installation and roof friendly. Full aluminum body.
Oh yes, you would need to have a roof box to use these racks with.