what kind of bike do you have? if you have grip shifters that means you have index shifting right? do you really want to go retro and have friction shifting?
I think you should look at indexing bar end shifters.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk