Trail Bug Brake suggestions?

#1
My mini bike's brake was long gone when I got it so I am in the dark as how to get the right one. The replacement "new old stock" sprocket is 72 teeth 5" dia 1" 3/8 depth. It will be welded onto existing hub after old sprocket is removed. Hub bearing uses 5/8 axle. Aftermarket brake set up is fine. see attached pics THANKS!
 

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