Thank you I appreciate those pics by the way. 
Let's see if I can explain in words. since I cant draw a pic at work..
They are the gussets that go on top of the bar that is welded onto the frame. There are two per bar, one around 2 O'clock and one around 10 O'clock. Welded to the bar and to the frame to keep the slider from comming up into the cab. I hope I explained it OK. 
Wow cool thanks wermz!
That does make a lot of sense. I think we totally get it now. But if anyone out there has any pics of it, that would still be cool!
