Help me identify downtube shifter boss type
Those look like standard shimano-style downtube shifter bosses.  You would need some downtube shifter levers ending up something like this:

If you want to use brifters (integrated levers) then you need a pair of bosses to stop the outer, which look something like this:

With these, the outer cable continues up to the levers either in a graceful arc, or to the bars so it can pass under the bartape.