Originally Posted by the_stig
i want a real boss knob!
Must...Resist...Urge to comment. LOL!
I bought it at partscheap.com: Mustang Boss Black Shift Knob
You'll obviously need to replace the boot, too. They sell a couple that fit, one in alcantara from the GT500, but I went to RedLine to have both shifter and e-brake boots custom made for me -- they're a little shop in Poland that uses good quality Italian leather and they're very, very nice. Got a new boot for my last car from them, too. If you go that route and want to match the wheel like I did, note that "charcoal" is lighter than the darker almost-black on the rim, unless they sent me the wrong one. The leather quality's fantastic, but you'll have to wait a few weeks for it to come in. Partscheap.com oftentimes has a bit of lead time, too.
Boot: Ford Mustang 2010+ shift boot - RedlineGoods leather shift boot store