i mean the gear knob itself, the thing you gonna buy, the thing you gonna touch everytime you shifting, is 7cm from top to bottom..
the EVO = mitsubishi evolution, I have an evo 7..
i TOOK OUT the shift knob on my car for you and see under it, there is some cm of UNTHREADED area (like 3-4cm?), so it is meant to be like that, as my evo ALSO HAVE unthreated area like your GTT.. hope it helps..