Carolina Reaper Peppers are freakishly hot chili peppers that we grow here at home. You probably will not find them unless you grow your own so I would suggest using either Habanero chiles (easily found at the grocery store) or the hottest peppers you can stand. The salty sweetness of the brine takes the heat away so the only HOT you'll be getting is from the glaze.
Additionally, make sure that you are cooking in a well-ventilated area or outside with hot hot peppers-- the fumes can become like pepper gas if you aren't careful! I always turn the vent on over the stove.