My 2003 montana shimmys firestone said right front hub bearing I changed

I don't know that you will get a shimmy from a bearing like this. See if you can find a repair shop that can do a "road force" balancing on your wheels. This equipment will simulate force on the tires as they drive like there is the weight of the vehicle on them. Alternatively, you could have an axle shaft vibrating.in the front also. This can be checked with the vehicle in the air.