my girlfriend bought me a shift knob for Christmas. I just tried putting it on, but I don't know if it'll work. The instructions say to find the right spacer and just put the knob on. It doesn't screw on or anything like the stock shift knob. The spacers don't go past where the stick widens at the bottom. I suppose that this shifter won't fit, am I right? Or does someone have experience with these and know how to do it. (is it just the stick that the Z has?)