47-55.1 Radiator support

[8man]

I was looking at the radiator support, getting ready to build the brackets for it and I compared it to this picture in the S10 how to write up.
Radiator pic by Robert Moorman, on Flickr

The one for the 48 didn't have a piece on top.

So I pulled out the one for the 54, and it doesn't have a piece on top either.

Alright, i went to a couple of build threads and checked out their radiator install, and they had a straight piece across the top.

Where can I get one of the pieces I'm missing. I guess the first step is to know what it is actually called, because checking a couple of parts sites has not helped me out.

Thanks.