What izzit & where does it go
 

Pretty sure it goes up by the hood latch(48 GMC) or in the grill area somewheres. Only thing is, I have all that together and nothing seems to be missing.
https://lh4.googleusercontent.com/-0...33%2520003.jpg
https://lh3.googleusercontent.com/-S...33%2520006.jpg

Re: What izzit & where does it go
 

It looks like a brace and since the holes look threaded I'd guess it goes on the back side of the panel to reinforce it. Probably real close to the hood latch.

Re: What izzit & where does it go
 

You'll find out if you need it, if you have two bolts left over.