Hi. I ordered a 10 x 20 run online and there is a missing piece! I'm trying to find out what this piece is called so I can start looking for a replacement for it! I contacted the website, but still have not heard anything back. So I'm kind of giving up on the idea of them sending a replacement. And I also do not want to have to spend hundreds of dollars again on a new kennel if I can't figure out what this is! I hope someone knows what this is called! Or if someone knows where I could buy one from! Thanks in advance.