I just picked up a 1997 Terry Classic. The bike originally came w/ brifters but I removed them when I spotted what I thought was a downtube shifter boss. Where the bosses are, the bike had cable stops that screwed into the bosses on the downtube. I removed the cable stops and thought I found square shifter bosses on the downtube. recently got a pair of downtube shifters (square boss) but they don't seem to fit the bosses. Could there be more than one kind of square boss? or are these bosses just to hold the cable stops? thanks!