So it looks like i'm in the market for some Arca style QR plates. Problem is I don't know what i need, and they have no website. What would work well for a Canon 300mm 2.8, 5d, and 5dmk3? From reading another thread about straps that I can't even find right now, i found http://www.adorama.com/KIRQRC1.html. It looks like Neuro uses these, and if they are good enough for him and his heavy gear, they should work well for me.
You ask about plates, but then you link to a clamp. Color me confused.
http://www.tripodhead.com/products/lens-plates-main.cfm for lenses
http://www.tripodhead.com/products/camera-body-main.cfm for camera bodies (not recommended for a camera body holding a 300mm f/2.8L IS).
http://www.tripodhead.com/products/qr-clamps-main.cfm for clamps, I prefer the longer ones for more flexibility in finding he center of gravity with and without a battery grip or a teleconverter