Problem with rear drum brakes

Hi!

When I bought my 1963 Dart wagon 3-4 months ago, the previous owner said that all drums was overhauled. I think that is sort of correct since both brake cylinders and the brake shoes look fresh.

However, the right drum brake does not work and the left one is not pushing shoe pointing backwards in a straight fashion.

I am a total rookie when it comes to drum brakes, so now I wonder: How do I know that they are fitted correctly? Look at those washers on top mount for the brake shoes (where the two springs are attached). Should they really be there? Are they needed to push the brake shoes in place against the plate?

The left brake shoes seems to be hold in place very sporadically? No plate/washer pushing the springs down?

Is the parts even made for these actual drum brakes?

If I want to buy spare parts (spring, shoes, dust covers for the two adjust holes in the back of the plate, etc), where do I find them?

Thanks in advance!

Kind regards /Pete