There are 3 shift knobs that will fit and have the overdrive button. There is the Levoc, the Razo gun-grip and there is another Razo shift knob. However, you could buy any automatic shift knob and just relocate the O/D button.
when i get my new shfit knob, i think i am going with the razo gun grip, it looks so nice, i can get it fo $80, which is real good. but how hard are they to install? anyone got pics with the levoc or razo installed?