I had a hard time finding information about radiator grill. The comments that I read indicated that you had to get it at Lowe's and that the people at Home Depot wouldn't know what you were talking about but I found the opposite to be true. (I got mine at the Home Depot on Kingshighway. It is 36"x36" and cost around $30.) It is aluminum so see Brooklyn Limestone's little hack for using the bulldog magnets if you are making a mail center.