AFAIK the F04 beamshaper for E-series lights should fit. I do not have one of those myself though, so I cannot give you any real-world feedback on how useful the F04 on the KL1 is.
Got my F04 last night, its good. But if you want flood, the QIII is better. F04 blocks quite a lot of light and turns the beam color from white to a bit yellow.