Mystery Solved: Rear Wheel Cylinders 65-69 vs. 70-75

Please post more pictures, please. I'll reciprocate, if needed. I have a 1970 Swinger 340 with the build sheet and fender tag. After a dozen years of being blown apart, I'm finally rebuilding her. Most parts came from my FABO family. I've never been screwed by any member of this site, FWIW. Paul.