I had a friend with those "aqua-lenses" and he drilled a couple of holes in the bottom and it worked pretty well. I've heard you can also remove the actual glass lens from the housing, clean off the mating surfaces and resealing the housing so it is fixed and no debris or condensation can cause the bulb to burn out. Good luck.
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previous name: 84stangLX
'84 Mustang 5.0 LX
my LX
'89 Mustang GT
my GT