I have a UUC RK6A shift knob for sale, I got it awhile back and decided not to use it in my m3. It is in mint condition and by fair my favorit shift knob.
Here are some pictures from my 335i, I can have close up and more detail pictures for you later on if needed
Picture from UUC Website
They go for 115 brand new, I am looking for 85 Shipped (buyer also pays for Paypal Fees)