I'm about 99.9% sure that this is all I have, with the exception of the driver side fender, doing patch work on it now. That's all the truck had when I got it.
If you could take some pictures I would love to see them. It is hard to search for parts when I don't know what they look like. Doing some searching around on ebay I found a GMC hood latch panel
Pic01 Pic02. The seller says that it is off of a 56 GMC truck. Would this be one of the pieces I am missing and is it the same as what would be on a 57?
Bartamos, I think I may have figured out that assembly. U-bolt goes down through the support bracket, then rubber shim, cross-member, springs, washer and lock nut. If that's not correct let me know.
What really stinks is that the Chevy assembly manual shows every piece on the whole vehicle, except for this one area where it is different on GMC.