These low-profile pickups are designed specifically for surface mounting on cigar box guitars. They eliminate the need for cutting a large hole in the box and slotting the neck.
Simply mount on the surface of the box and run the wire through a small hole to connect with the rest of the electronics.

8.8k Pickup. Dimensions are 2.5" wide, 1.65" tall and .23" thick.

Covers not included, find  6 string covers here.

Cover template here.