The Cooler Master TX-3 is under that height and is an easy install on an AMD retention bracket. Snaps right on like the stock cooler. http://www.newegg.com/Product/Product.aspx?Item=N82E16835103064
I put one on my other PC with a PhIIX4 965BE and O/C it to 3.8GHZ with no temp issues at all. Kept it nice and cool.