There is also a very thin steel washer and a rubber washer between the crank arm and the linkage arm. I also did a quick look on ebag using "cuda wiper linkage" there are no correct parts for a 70 3sp.
Yes Bruce, very hard to find. No one making them. Bob
Mom & Dad let me buy a brand new 70 Challenger R/T 440 Six-Pack Super Trac Pack when I was 17