They look like the bits that are welded to the front panel that support the dash just under the screen rubber.
Don't have either panels yet so I'm not too worried at present, I may bolt them back to the dash for now tho. I do however now have a side pane cutl as of 10 mins ago. O0 Finally be able to fill the hole in the side of the bus.
Fit to inner panel for dash, you can't go wrong as they wave in and out and will only fit in the right position.