Maybe…. It all depends. You can switch this friction yes? I never saw a lot of Synchro shifters but I don’t recall plastic covers. We need to see if the backside of your piece looks like the backside of the metal one, part #8.
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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