I bought an '06 GT with 5 spd. I am not thrilled with the stock plastic shift knob and would like to install a black Hurst "billiard ball" (Part #163-0114) on the stock shift mechanism. The new piece is spec'ed at 12MM x 1.75 MM. I am assuming that 12MM refers to the thread depth and 1.75MM refers to the thread width. It comes with a stop nut so you can tighten on shaft. Has anyone atttempted to install one of these? If so, was it an easy swap? It seems like the stock shift knob is somehow connected to the boot to keep it in place? Whenever I turn the knob, the boot turns with it. Any suggestions/input?