I believe this is a factory-done parkway conversion, as it has rivets/screws between the two rear windows (Please advise if I’ve got this wrong). This may have a government plate, too.
“Willys Jeep station wagon 1964 2 or 4wd 230 overhead cam engine, rare ambulance double doors, good body great rat rod clear pa title”
https://lancaster.craigslist.org/for/d/willys-jeep-station-wagon-1964/6487882092.html