Doh! Just what I get for trying to be prepared--I bought my NuShield a couple of weeks ago, before I ordered the 6K. OTOH, it sounds like even the model-specific shield doesn\'t really fit, either. Do all NuShields have the tapered top and bottom? The G2 I have on my 5600 is squre (well...rectangualar), and although it was a pain in the butt to install, there are no gaps...