Today I found a way around that.
While playing with my ITX project, I was lookin for a cover. I was looking to cut it out of metal, and there was a Volcano9 laying around. The reason it caught my eye is because of the little bracket on it.
That bracket was perfect fit for the hole I was trying to cover. Now that I come back and look at this project, I see that making a simmilar bracket for the radiator would be ideal.
The line is what I cut out for the project.