I ordered this one one week ago: http://www.ebay.de/itm/110751484606 The curtain is very good, thinner than the russian one and more flexible. And the seller is quick (less than a week from Japan!) and not expensive. For 15 US-Dollar you can make 6 pairs of curtains for FED, Zorki or Zenit. He also sells straps for just 1$ per meter.
By the way, it was the first time that I replaced the shutter curtains. I thought it was more complicated :-)
yes, that looks good too. But often there is no need to replace the straps, only the curtains are broken. And then it is less work :-)
By the way, I have replaced the curtains in 3 cameras now, two Zorki 1 and one Zorki 3M. It's a pleasure how low the tensioning of the springs can be if the curtains are new. The cameras (especially the 3M) cock now so smooth as a Leica and they release very quiet.