wiper arm

I have a 1966 Wildcat sedan with a single wiper arm. And in Oregon, it does rain, sometimes. So I am looking for a second one or a pair. But all the new wiper arms on the market are just junk with plastic parts (e.g. ANCO). Would someone know whether the wiper arm is interchangeable with...

I am looking for a wiper arm -- a single one. But if you sell a set that's fine too. I have a 1966 Buick Wildcat sedan. Here is a picture of the single wiper arm I have. Best would be a matching one (in my dreams). But any arm that is not a piece of ANCO junk with plastic parts would do.