The top grill on the 500R can be taken off so if the rad is too high you can just keep it off. I have my H100 rad mounted up top and it fits fine but I leave the top off just for a little better air flow amd exposure to ambient temps.
So I think you can. I know width wont be a problem and as long as you don't mind having that top grill off, height wont be a problem either.