I have a friend that wants to sell me his Cadet Kit for a very good price will it work on a CZ 75 BD Police model ? It is a 9mm. He has a it on a 75B.

If it is working on his 75B then it will work with your 75BD. Keep in mind, if you swapped the main spring, and lightened the DA trigger, you might have problems igniting the rimfire primers.
The Kadet kits are fantastic. I bought one second hand via the classified section here. I am really getting a lot of use out of it. Accurate, reliable, super fun and cheap to shoot.

Should fit. How tight will depend how much material was removed (if any) to fit on his 75b. Shouldn't be a big deal tho. Congrats on the deal. They are sweet shooters

Buy it, don't look back. I have run mine on a 75BD.

I've had great success with my Kadet Kit on a CZ 85. Fantastic shooter and a great value.

H&K-Guy

Thanks I'm meeting him Friday after work.