Before doing any of the following, please disconnect the negative from the battery terminal marked -.
You can use any auto shift knob. In order to do so, you could use the O/D button already available or purchase your own rocker switch.
You will need to detach the stock one and be careful when removing t as the wires for the O/D are there. Cut the wires and move them aside. On the shifter plate (plastic piece) drill a hole to fit the size of the button you are going to use. Insert your new knob and run the O/D wores under neath the shifter plate and up into the button. It is your standard on/off rocker, so wire and wallah. You have basically customized the movement of the O/D button by maintaining functionality and upgrading your interior.
That was a quick version of a delicate process...
for any questions, hit me up