Well you were correct, but they didn't need to send me a new one. Apparently, the slide stop for the 85B works just fine with the Kadet 2 kit. They told me to just use the slide stop from the 85 instead of trying the one that came with the kit.
I guess I should of just tried that to begin with, but I just spent 900 dollars for both pieces I am a bit timid right now lol
... Still trying to work out the do's-n-don'ts without having to shell out money to make repairs.
It is my first gun.