I ran into the same problem with the warning triangle. I got the brackets and screws at Crown.
http://www.crownpartsonline.com/partlocator/
Here are the part numbers - order 2 of each:
Bracket: 51 49 7 167 548
Expanding nut: 07 14 6 976 114
Screw: 07 12 9 905 220
Oh, and only spent $2.24 + shipping for all 6 parts!