Duster radiator over flow reservoir

There is a thumb-sized nub on the bottom of the factory bottles.
72 and older A-Bodys require a hole drilled in the top of the frame rail for it to fit. Otherwise you can not attach the brackets in the rad. yoke.
You will also need a double-gasketed rad. cap made for cars with overflow tanks, otherwise the overflow system will not suck excess coolant back into the rad as it cools.