Rear brake size
Can you try to measure the shoe from top to bottom to get a ballpark what size they are???
That one on the left is no good. That top triangular slot will not hold the upper spring loop, it should be a circle like the first hole on top of the shoe that it is next to. Th triangle hole is too big for the spring end to stay connected. Been there - done that.
Some of the companies are trying to "commonize" their parts and they won't work in some cases. These companies are clueless or don't care. Find some shoes with a circle hole for the top springs, not the triangle slot.