I recently "acquired" a group of 4 theater chairs. I have a few questions though, as they were not together when I got them. Do I need to get specific standards to put the chairs together (when I got them, I grabbed 2 "A" seat bottoms and 2 "B" seat bottoms, plus a bunch of standards, and a left and right end standard)? Second question, if I were to make a riser base for them, does anyone have a schematic or dimensions as to what they used to make one? Any help as always is greatly appreciated.