Gibson Home Gracious Dining Dinnerware, 3-Tier Rectangle Plate Set with Metal Stand, White

What size are the plates? Length and width please.

Do the arms swing our independently of each other? I am interested in purchasing two sets and would like to arrange them diagonally.

We just recieved the order and the trays are not even close to the demensions on the web page? They are 12 x 6

I recently bought the 3-tier stand and plates when I got home with the box there were no plates. Is there a way I can purchase the plates alone?