The three left most pieces of plastic (in the packaging) are extension pipes.  The left most plastic pipe unwrapped (i.e., outside of its packaging) is the overflow outlet pipe.  The right most unwrapped plastic pipe is the part that will attach to the drain hole in the tub (the silver metal piece next to it is the drain plug); the piece of plastic pipe between the overflow outlet pipe and the drain hole pipe will be used to connect these two pipes to the catch (with an assist from one of the extension pipes).  The other items are collars and gaskets (and one decorative piece of metal -- the part near the two long screws) which will be used for creating a tight seal when installing the pipes.

I took this photo on August 31, 2000 (copyright).