It shouldn't need trimming/filing, mine went straight in. I've not heard of the other 3 kits I know the owners of having problems either.
Are you 100% sure the tranny is together fully? May I suggest building the tranny up and screwing the motorplate etc on then have another look at how it fits. If you've still got troubles maybe you could take some measurements the hole and box bottom and I'll check everything is correct.
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