here is a few pics of the 75 carrera tail that i have on a car that i am the third owner of and have the history to the present day. i will get better pics of the underside but you can see it has a metal tray on the underside and a piece of plastic trim around the perimeter under the base.
1. Lip around tail rubber
2. Base of tail metal
3. Tail it self fiberglass bonded to metal base
4. Metal heat shield or cosmetic tray metal stamped
5. A plastic trim or seal around the outer perimeter underside of tail edging.
6. Plastic grill
7. Alloy carrera emblem on center rear of tail
will post detailed pics when i get a chance