he needs one for a stock auto shifter apparently.
i remember seeing some from one of the aftermarket 5.0 places that has them for the later models and are the t-handle style like a hurst shifter. you can even get them engraved with GT, mach 1 or bullit lettering as well. i don't see any reason why it wouldn't work on an early model as the basic mechanism is still pretty much the same.
http://www.uprproducts.com/shopping/shopexd.asp?id=1006
here are some stock looking ones from mustangs plus
http://www.mustangsplus.com/Merchan...&Store_Code=MPFMP&Category_Code=shifter_knobs
can't find the ones i was looking for but i may be condusing them with a t handle for a standard trans. anyway i found these in about 5 minutes of googling. using "mustang billet automatic shifter handle" different combos or words will likely bring up a ton more info.