As I recall, there are no clamps for the brake lever housings, only a hole in the bars, a reinforced and threaded hole, mind you. But that hole, makes it impossible to install a new stem.
Now, I might be wrong about what I remember, but were I you, I would first feel for a clamp band. If none there, I would keep the bars as they are and find something else.
__________________
"98% of the bikes I buy are projects".