I know this is an old post, but I just want to thank Slantsixdan for posting this and saving me the frustration and issues of trying to fit a starter like the 1991 318 the other person bought, on my 1964 Canadian Valiant!
With the popularity of slant sixes and the time that had passed I searched to see if there was now a proper mini-starter for our early model Canadian slant sixes. I finally found one from a shop in Australia. Link below.
Again, a big thank you to Slantsixdan for sharing his knowledge here to the community!
https://www.plumkrazygarage.com.au/