AH HA!! this is it. if you don't grab it I just might have to scoop it up for the spares bin
http://cgi.ebay.com/SHIMANO-vintage-...item3cbb0958a7
the backing plates of course adapt the shimano shifter to the boss, but that funky cutting on the edge adapt the backing plate to the clamp.
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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