My drivers side (lhd car) rear light has decided to melt the little plastic cylindrical houseing that it sits it. My meagre attempts

to rectify the problem have failed miserably so I am now going to have to bite the bullet and hit the stealers for a replacement.
So the question for you fellas in the know is how much am I going to have to shell out on a replacement bulb housing?? (facelift)
Cheers,
Wig