'73 (and up?) radiator overflow bottle?

The '74 bottles I have had in a Dart Sport and Duster were similar with one exception. They only have one overflow hose connected to a nipple molded into the top of the plastic bottle and on the inboard (radiator) side. The short nub on the bottom of the bottle you can barely see in your picture rests in a hole in the right frame rail. A metal bracket is fastened to the bottle and is used to mount it to the upper edge of the core support, just to the right of the radiator. The overflow hose runs from the bottle's nipple to the overflow outlet on the radiator fill neck. I can get pics later, if necessary.

Jerry