where abouts are you Beast. If we know where you are we can probably refer you to someone local to you that can sell those parts to you.
Getting them from Mitsubishi is a complete rip. Over $400 for the belt and tensioner last time I checked. Really any shop like Repco should be able to source the belt for you, not sure about the tensioner though.
If you find it easier take the belt and tensioner with you and then they shop should be able to find an equivalent, for sure with the belt anyway.
Mate another tip, to make life easier on that side work on it from underneath. Jack the car up then take the drivers wheel off and you should be able to see hoe you can take the inner gaurd out so that gives full access to that side of the motor. Much easier from down there than on top
