Dumb Question.

I've looked around a good bit and haven't been able to determine if buying caster/camber plates replaces the upper strut mount assembly or not. My guess is that it does but am I still gonna need to get bushings of any sort? And even then if I choose not to do the caster camber plates, What would I need as far as the upper strut mount assembly. I google searched around and I'm getting various parts. Some kits are just bushings it looks and other kits appear to be bushings+ a whole new top mount. I'm just a little confused and need a bump in the right direction. Thanks in advance!