Those reflectors are designed for the incandecent bulb and not an LED. Also for an LED, you need some sort of heatsink, or else the LED will die promptly. Not that these reflectors might not work with an LED, but certainly somewhat of an unkown, and after lots of work you might not be happy with the result.
I think that if you want an LED you are "much" better off geting a BugOutGear 3W LED replacement module. See my sig so that you can get an idea how they look like, etc.
Will