I'm starting my first magmod build and need some help with heatsinks. I have a D-cell incan host ("D" in the s/n) and plan to use a mod'd Rebel reflector (p/n 108-046) along with a XM-L U2 on a 20mm star and 17mm driver board. I'm confused as which H22A heatsink to get. Can anyone hit the easy button? TIA