I never checked these but I know my vertex got pretty warm. The heat sink on these are a lot better but they also have 12 LEDs. I can't imagine it'd be enough to melt the housing. They are designed to be mounted in housings like that.
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6 months later, still working great and no water intrusion or heat issues.
I've got whelens for rear facing amber and they only have about 4 LEDs per that still work.
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Haynes Offroad makes a cool rear facing light that attaches into the hitch. May be another solution to consider. I was thinking of picking one up. Seems like an easy solution.