hi guys, new to this forum just had a question on drop bar conversion . i have a flat bar on my bike right now with grip shifters. so far what i have on my list to buy

drop bar handlebars
drop brake levers
bike stem

and i just had a question about the shifters. i have notice that the drop bar shifters are quite expensive . however i found these

http://www.amazon.com/SHIFTER-ROAD-A...d=VRLDIZ9F5782

i want to know if i can use these and mount them to the stem. or do i have to get drop bar shifters?