Hello, I do not post much and I hope that I am doing this correctly. I have here a reinforcement plate # 2901689 Group # 23-34-176. The parts book shows this as W series fast back 1969-70 which is usually Charger models. I have a 1968 Charger and this is not shown in the parts book nor can I find it on the car. Is this something for support due to the change in tail lamp design and where is it located? It is about 6 inches on one side and 4 3/4 inches on the other. Thanks for any help. Kocan