I just picked up a set of Sierra Denali tail lights and was thinking about trying to customize them with some LEDs. I'm sure they come apart, just not sure how...
If they're like the headlights, you'd have to bake them and soften up the glue holding the lens to the housing. Then carefully cut the seam with an exacto knife or something similar.
I think mr OG dizzle cut open a set for some LED square lights that he put in replacement of bulbs. thats just me guessing by a visual. that could be wrong and very un helpful lol. but people do weird shit sooo good luck champ