To start with i'd think about the bearing sizes either side of the spur gear(s), on most 1/8th buggies these are 8 x 16 x 5mm so if they're that size on the TNX or if you can find a way to use bearings that size you can probably somehow use a 1/8th buggy motor mount of one type or another.
Or if the OD of the TNX bearings are smaller you could maybe make something up to adapt the motor mount.
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