Joined: Nov 2005
Posts: 4,037
Likes: 2,117
From: NW Ohio
Bikes: 1984 Miyata 310, 1986 Schwinn Sierra, 1987 Ross Mt. Hood, 1988 Schwinn LeTour, 1988 Trek 400T, 1981 Fuji S12-1977 Univega Grand Rally, S LTD, 1973 Sears Free Spirit 531, 197? FW Evans
The shifter boss looks like the one on my Miyata, which is Shimano 105 (Golden Arrow) top mount levers. There is a fitting that mounts onto the boss, then the shifters mount to that.