Looking for a custom shift knob? This is the place.
http://www.lathewerks.com/shop/I am currently finishing up a mod in which my automatic transmission will have a shift boot and trim. I wanted a 5 speed shift knob so I had a lip to attach the boot to for a clean look. Problem was that a 5 speed shift lever has a bigger diameter than the 4EAT shift lever. So I emailed Chris from WC Lathe Werks about what I needed. He replied that day and had an answer. I just ordered the 4EAT shift knob that I wanted and he machined it with a lip for the shift boot. A week later, today, I got the knob in the mail. Excellent craftsmanship. Nice heavy, clean, durable knob. Very well made and works perfectly.
The site has a large variety of shift knobs and they all can be customized with different sizing and engraving and materials. I think its the best place to get a shift knob that is unique and can include everything you need or want.