I think I understand. I think we are saying two different things.
I was saying that if you are missing the bracket, you can push the screen at the upper edge INTO the case deeper than it should go.
I think you are saying that the screen is not going into place properly. That is, the screen is sitting higher than it should be OUT of the case? When you pushed it in, then the new screen cracked? If this is what you are saying, then I understand the answer: look around at the directions and the cable on your original screen: the flat ribbon cable to the new screen needs to fold in a zig-zag (like a "Z") so that it does not interfere with the new screen lying flat like the original screen.
Does that make sense?