No not at all, the 370Z, 350Z, G37, and G35 all use the same size shift knobs any of them are compatible, in fact my Zele shift knob was made for the Zele 370Z, I just yoinked it and the exhaust. You're fine ordering it as long as it is M10x1.25 threading you will be fine.

saw you had the Tommy Kaira knob back before...im trying to get one for my 2008 G37S Coupe .....is there a model to look for that fits our cars? or any 370z verison will do?

thanks for your help!