I think it’s the bracket that holds the high pressure power steering line. There should be a clip that bolts into the elongated slot. It’s adjustable. I forget exactly where it connects on the other end, but I think oss is correct about it connecting to the egr somewhere.
just so you know..... That bracket isn't necessary. I removed mine 20 years ago and since then drove several thousands of miles on very rough dirt roads in Mexico and nothing cracked or broke or nuthin. Get rid of it. It makes life miserable.