Friend's got a newer Diamondback (not sure what model or model year) with a flat bar. He wants to convert to a drop bar like mine. He's getting aero levers (non-STI). What kind of shift lever mounts does he have options for? I know he uses a Shimano below the bar type shifter, but he thinks he won't be able to reuse it on the drop bar, because of the way they're shaped....

Can anyone help?

Update: bike mechanic said he couldn't, then we realized why. So he ended up getting STI...triple front w/ 8 out back. Since he has Tektro Vbrakes front and back we had to get cable multipliers. Took us (we don't know too much about bikes, although we have more background w/ cars) about 4-5 hours of work. Does need some more adjustment, but it's rideable.