If someone is interested i mounted a compartment filter yesterday as the pajero dont come with one here. It is mounted in european models so its easy to retrofit.
I used filter that has part nr: MR500057
First start by emptying your glove compartment and locate the cylinder on the left side, it can easily be popped of.
After that press the sides of the glove compartment to lower it and get access to the panel behind.
Cut out the marked rectangle that is blocked, done simply with a knife.
Insert air filter.
add 2 screws, they dont come with the filter or is there so you have to supply your own.
After that push glove compartment up again to get tabs to catch and put back the little cylinder and all done!
Simple and easy!