Just bought a new 2003 P5 and the shift knob on it is worn out, looking for another one that looks nicer. If you've got one I'm interested. Pic for example
It's an M10x1.25 thread pitch, you can find plenty of shift knobs that will fit online. I prefer weighted knobs personally. The newer models with a manual trans use the same pitch, so you can put newer Speed3/6 and Miata shift knobs on it as well.