I've got 3 part numbers for them.... ANCO 41-03 TRICO 51-250 NAPA WIP60725
I got mine from Napa, but depending on how tall you are (I'm 6' 1") you might have to use a longer blade than what the book calls for so you can see. Mine are 18" blades
Oreilly's to the rescue on this one....they first told me they had no wiper for a 1970 van. Then the guy calls a friend and asks him. He reports back the same blade assembly for a older mustang should work. So for $11 plus the $4.99 12" blade, I replaced the missing passenger wiper! The old NS on ebay was $60!
a little different from the driver original but it works!