Lower Dishwasher rack replacement

I ordered the part and was hoping to just take out one rack and put in the other, there were NO instructions or even a diagram of the rack. There was a fold down rack that was not attached and a few parts that I have no idea what they are. This was very discouraging. The main thing is that the rack is quite a bit lighter than the original one so I doubt it will last very long. The price was more than I wanted to pay but I didn't have any options in replacement parts.