aftermarket door latches that lock?

Ok anyone know where we can get bear claw type door latches that lock? We are finally doing my boss' 49 mercury and we put 2005 chevy malibu outside door handles on it. He wants to beable to lock the doors by the key on the drivers side and then also beable to lock the doors from the inside too. Speedway Motors only has the non locking style.

thanks
corey

The AutoLoc ones I bought for my Model A had a locking function on them.