A little bit of work to finish off the battery boxes. Barry confessed he wasn't entirely sure what these brackets were for, but since they were clearly original on my car it seemed right to transfer them across to the new boxes.
Which means, for the first (and probably last) time in the project, I know something Barry doesn't. As these pics of the 700 mile 70 S show (pics owned by David Conklin), they are mounting points for the horn brackets. Of course the horn spec kept changing over the years, so presumably this specific form of bracketry didn't last much beyond the 1970 model year.