A lot of sources are also wrong about the max cog size for NR as well. I am not really sure who actually makes them but I have purchased "EVO" brand freewheels from my LBS for under $15CDN and they seem to work ok. There were many to choose from (5 to 7 speeds) and different combinations of cogs as well. They told me that they were a 'off brand' of Shimano.