Summit has these new ones from Dorman. I read somewhere that they are built by Samsung.

http://www.summitracing.com/parts/RNB-742-300/

742-300 for the right side 742-301 for the left. You can get them at most parts stores but the price varies wildly. I've seen them listed for $70+


Mopar used the same motors with slight variations, mostly different electrical plugs, from late 50' early 60's up into the 90's


Kevin