Convenience Convenience Na Na exchange blade (middle teeth 3mm) (japan import)

How do you replace this blade?

Do these work for the bn64 model size? I lost the original set, purchased a new trio, but they are somehow too small, worried to get correct size!?

Does this blade go to the beige Benriner (Medium) ?

The medium blade is how many many mm wide? I mean the final cutted product.