This looks similar to some sites I came across last night. Unfortunately they don't list Magnas.
I tried to do a search on the gearbox number F5M51 but it came back with "Permanently out of stock"
Although it more likely means that they don't recognize that part number.
One mechanic suggested getting a repair quote form a Mitsubishi mechanic which should include part numbers.
I might have to do that, although I don't like playing people that way.
The other option is to register with a bunch of sites so that I can download what they offer as a manual and hope that one will have the require part numbers in it.