I'm not trying to flame anyone, just understand... Please take the following in that context.
The amber insert that was removed, as itself, is NOT A REFLECTOR. There is a reflective mirrored finish inside the bulb housing, and all the amber insert does is turn the reflected light or bulb light an amber color.
So, ddalder, are you saying that it has to be an AMBER reflector, or just any reflector? Are you talking front or back or both? Because even if you remove the amber, it'* still a reflector.
When I changed mine, I of course added an amber dual-filament bulb. I shined a light into the area and it bounced around inside the reflector and got some of the amber color off the bulb. Then when I turned on the lights, the amber shone thru brightly. Also, if I'm not mistaken, since the bulbs are dual-filament, aren't they on all the time anyway? (Running lights during daytime, and driving lights during nighttime) I'm sure they are always on in the nighttime, as I just drove home and noticed them tonight.
I followed a lot of cars home this evening and I looked all around to get an understanding. I found some cars (Infinity G-35 and others I couldn't make out being dark) doesn't even have any amber in the tail assembly...All Red. The front has a cleared lens with an amber bulb. Only red lights in the tail and amber in the front...I did not see any passive reflectors.