The shift boot IS the stock shift boot. there is nothing holding it up to the bottom of the knob. BUT I also have a short shifter so i dont know if mine will measure different or not.
I hope that I helped.
As far as ordering from WORX, DO IT. The people who were complaining about the ordering didn't know what was going on. He just moved Worx up to Oregon and all of his cnc'ing is still in Arizona. There were problems with the online ordering, phone service, etc.. I didn't talk to him for like 2.5 months. You can ask some of the vendors that sell his stuff and they will tell you the exact same thing. I just called up there this morning and they have a crap load of Shift Knobs available.
So if you order online DO NOT USE PAY PAL. They take the money right away. If you use a credit card the card will not be charged until shipped, in which you will get a tracking number. So you can either order online or you can call them direct. If there are any other questions let me know.