Looks like the passenger side windshield wiper was an option or not available. Same for the outside rearview mirror. Much different than my 2015 Wrangler.
I don’t think the passenger wiper was needed.
;-)
Probably missing or removed and very probably vacuum operated. My 65 had them. I bought an aftermarket conversion kit but they don’t work at all.
I plan to get a 68/69 windshield that supports the electric motor. Besides my windshield frame is rusted anyway.
The passenger seat was an option. I think wipers were standard for both sides.