So the K4 is a bit of an odd duck, as it doesn't really have a space for a LED heatsink.
When I installed mine, I just used the tri-cree adhesive thermal pad and stuck the LED to the bottom of the blade housing. This worked well enough but take caution, the blade holder is steel and doesn't provide much in the way of heat dissipation. If you plan to have this saber on for long periods of time, it will get hot. A couple of vendors sell (or sold) LED adapters for this hilt kit to correct that problem but I'm not sure if they're still available.
Check out this Shameem video for details:
https://www.youtube.com/watch?v=F45UroMDszw
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