I was thinking about finding al old Sturmy archer 5 speed bike and do the conversion myself. Could be a fun experience. But if the spacing on the 5 speed is almost the same as a 3 speed, then it's not that useful for me. As is live in a rather flat country I know there was a old small and medium width hub from Sturmy archer that should probably fit. But those are rather hard to find, and expensive. I do want to keep the Gazelle, as I inherited it from my uncle. So I am going to fix it with another 3 speed hub at some point.