Some of you who saw my fintail at PUB last year commented on the missing battery frame and the poor washer bottle stuck over by the brake booster. I couldn't bring myself to step up to $268 from Mercedes for the part, but I am happy to report that Joe Alexander came through with a well-used frame. After several discussions with Interstate, I found a top-post battery of roughly correct dimensions. Before and after in pictures.
Thanks to Joe for the help.