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Top gear with a 5 speed is still 1:1 ratio, the same as a four speed.
There is no "kit" that I know of for this, you have to find a used 5 speed (good luck) and then do the conversion yourself. It's not rocket science, basically the indexing camplate will be fun with the three selector forks and I think the output bearing is different.
It will be WAY cheaper to adjust your gearing a little with a larger front, or smaller rear sprocket.
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