Not necessary. This is a modification that you would want to do if you were a high-end carb tuner for a high-end motorcycle. Neither you or the GZ are either of those things. (And that's not meant as a slight at all.)
These bikes are very simple and can be tuned without ordering a specific jet kit, even.
What you get from jet kit manufacturers is a generic kit filled with lots of things that you don't need. Notice all of the various jets and shims that won't even fit your bike? The #59 drill bit falls into that category.
Just adjust your main, the needle, and then dial in your pilot jet and you're good to go.
Don't worry about the other stuff.
