Perhaps I should add that ordering brake parts online is EXTREMELY country-specific: E.g. it seems DiaCompe brake shoes by themselves (I did find some brake caliper assemblies) are not available where I am, nor the "normal" Kool Stops which Bianchigirll posted.

Although, luckily, I did find the (British) website for Fibrax, and it seems that they do send overseas, so I am now writing them to ask what their expected delivery times/costs are for (continental) Europe...