Well... I think those were made by somebody on this site.
I have them myself, I could ask the former owner but he is in the South doing post-Katrina work for FEMA and when he resurfaces we can ask him. His name is Bobzilla.
Also, mine may be removed and replaced, they are a little bent but nothing that you cannot fix with a pair of long nose pliers, so I will let you when I do.