MHS CopperNova Cooler Heat Sink with 6 holes on the face that funnel the wires into one hole in the back.
These will work with Tri-LED's and single LED's. The hole is just barely smaller than the optic for a tri-rebel so you need to be sure to center the star and optic as close as possible.
You do not need to use nylon screws with these and the holes are for the wires to pass through. It would be a good idea to use a thermal adhesive pad to attach the LED and keep it from moving around during assembly.