Shift knob replacement

I wonder why the shift knob of Touring has a pain look. I want one with Mazda logo, or personalized symbol. Can someone recommend a store and how to replace it? Thanks.
 
Screws on. Right tighty, lefty loosey. I have yet to figure out the proper thread measure for it yet.
 
It is weird to me too that they have a circle on the end of the shift knob but no emblem in the middle.
 
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