I used a heat gun on the first one, and then tried the oven on the second because the heatgun was sooo hard to use with only 2 hands. The oven worked EXCELLENT. They pulled right apart and they look great still. Make sure when you put them in the oven you face the taillight up. Good luck.
Meanwhile, can someone also tell me how to make a decent reflector, because the ones I made snapped in somewhat but then I had to use krazy glue to keep them in place, and when the glue dried it gives a foggy appearance on the edges. I wanna make replicas that can snap into place, without glue, but the plastic it too flimsy. How did you guys get your reflectors to stay put, did you have to resort to glue, or did you find a decent (non flimsy) peice of plastic that shapes well?