I'm now going back over what you asked. , I just haven't figured out how. I thought you were originally asking about the adjustment holder plastic which break if you fart near them. You mean the black plastic back pieces that hold the light in the housing. I have found no way to remove those without breaking them. I'll give it a shot when I head back out into the garage. I did look at them and they appear to be snapped on but when I tried removing one, it broke, go figure. Sorry for the confusion. I report back with anything I find tonight.
/brox