Tail light Section??

I just got a 72 duster, and the section of the body that holds the tail lights is kinda rusted out, so I want to replace it. Does anybody know what this section is called or any companies this section? It is also rusted a little on the drivers side very back corner where the quarter panel meets the tail light panel, so if I could find one that has about 6 inches or so of the quarters it would be great. Let me know if you know where I can buy this section. Thanks, Harley