The '80 voyager didn't have shifter bosses? They are more expensive than your choices but I think these will be a better shifter especially if you are keeping this bike for awhile.
http://www.ebay.com/itm/Vintage-Rale...item1e75e1a1a0
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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