Good pictures. If I'm seeing it right, your arm is the type I've described; slips onto the shaft and the acorn nut cinches it down. I think I even see a bend in the arm out near the end (image #1727). So for the exception of the tip and how it connects to the blade, it seems very similar to what I have come to believe is the correct wiper arm.
Going back and looking at the KW example closer, it has the newer style of connection to the shaft that I was describing (nut on and then the arm clips down on top of that nut) - see the second image in their listing where it shows the arm at the base flipped upside down. That's closer to what I had when I got my jeep. A PO had gotten a wiper from somewhere and made it work. I would just swap out the wiper blade rubber insert (at the time, they were just $2 and I got two out of each insert) and keep on going.
**One thing you're forcing me to do is go into the garage and look at what I have to help me remember....*
I knew I had a chrome arm (advertised as replacement), a new original style and a used original. The chrome replacement was shorter than the original (see below - shows original used compared to shorter chrome replacement). The new original style arm was listed as NOS. So naturally, I bought one and it matches the used original perfectly. I'd forgotten where it came from but luckily for me I put it in a bag labeled "NOS from Pete DeBella" so a few more types on the keyboard and here is his listing:
https://www.ebay.com/itm/Vintage-Willys-Kaiser-Civilian-Jeep-CJ3A-Windshield-Wiper-Arm-NOS/184469032030?hash=item2af3360c5e:g:tfkAAOSw03VeaASaHe also has NOS blades too.
http://www.debellajeepparts.com/CJ2A_BODY_CATALOG.htm(near the bottom)
WO-500813 Blade, windshield wiper $5.00 NOS
FWIW
