this grip (Bill Davis Large) works but it feels small to me.
I wonder how it would feel if it was an enclosed backstrap.
They stop making these grips many years ago. They don't fit tight. If you tighten the screws too tight....they push away from the frame.
well I guess I am wrong. A google search netted this....
Davis Custom Grip - BILL DAVIS ENTERPRISES
I removed the single finger groove.