Kari 613,
I assume you are talking about the inner ring/cap on the center piece of the tail-light lens. If so I have some experience with this. Last fall a guy on a motorcycle bumped me, and smashed the tail-light. The chrome ring popped off and split in half, so I got a good look at it, here is what I saw:
- adhesive is a black tar like glue, hardens with age, and so loses tack, and should pry off.
- the glue is just dabbed on, so on mine it covered only about 30% of the inner surface.
- as Dave55 says, the "chrome" plating is on the underside of the plastic
- bad news is that this "chrome" sticks to the glue and will pull away from the ring
- when the chrome pulls from the ring it is really tough to touch it up
On the positive side, you can buy the ring itself for about $17 from Mac's or you can get the whole assembly with chrome ring at Concurs for about $65 (call to ask them).
Hope that helps.