SkyDog75

Those are a couple of helpful pieces to the puzzle. With a little more info, like the number of cogs on the rear wheel and what brand/model the derailleurs are, we can probably tell you exactly what you need.

So far, you haven't given us anything that tells us this won't work. It can probably be done -- it's just a matter of what specific parts you'll need: Just shifters? Shifters and derailleurs? Shifters, derailleurs, and freewheel/cassette?