Like James said, you do not need a specific plate for each camera or lens. BUT, with Bogens system, you do need a specific plate for the quick release system that you have. All of the plates I have are identical, and they all fit the RC2 system. Bogen does make other systems that use a different plate, that will not fit in the RC2 system.

The system that Bogen uses just crew into the tripod socket on the bottom of your camera, or the tripod collar on your lens.

If you go with the Arca Swiss style system, you will need a specific L bracket designed for your specific camera or lens.