Help!!! Where is this part from..?

Hi everyone. So I've just gotten through replacing the oil and water turbo lines on my GU2 ZD30di which involved removing the turbo and a BUNCH of other things. So the work originally started months ago and life got in the way so when I finished recently, I had this Brace looking part left over. I still haven't re-fitted the turbo heat shield, and my feeling is it's off there somewhere, but I really can't remember removing it in the first place. Can anyone please identify what it is for me? Cheers