that is going to be a difficult one to find, maybe get part numbers and ebay would be the best bet.
CompetitionX is a decent place to find manuals for discontinued HPI vehicles if you dont have one.
was the MT1 sold in a "super" variant? for some reason i though that the only one was the on-road version sold as a "super" because it was a bit longer and wider. think it was classified as a 1/8 scale not a 1/10.
i could definitely be wrong though!
the super is also belt drive, is yours a belt drive? or shaft drive? the Nitro RS4 MT was shaft, the electric version was belt drive though.
Hope you find what you need!