Mopar wiper arm identity?

I pulled these wiper arms off a mid to late 40's mopar(if I remember correctly). These are held on by a 3/8 nut that is part of the arm. They are made by the Anderson Company. Are these for electric wipers? or? I wanted to know so I can tag them for future identification. Thanks for the help. later shawn

 

Bttt

 

My "54 Plymouth , which has electric wipers,has that type of wiper arm. I'm not sure what years they used that style arm. Bob

 

My 59 Chrysler Ute has those. It was factory modified from a 54 Plymouth. Hope that helps. Yes they are electric. Frank

 

Thanks guy's. I'm wondering if they retrofitted the electric wipers to that car, dang I knew I should have crawled under that mess and grabbed the rest. later shawn

 

No they used the same arms from 48 thru 59 the outers were a little longer on the 57 and latter. Bob