I made this key housing for my 2006 Honda Civic after the casing broke. If you still have the metal key part and the circuit, then you can rebuild it. It may also work for keys from other Honda vehicles from the mid-2000s.
The dealership told me it would cost 115$ to get a new one. So I saved a hundred dollars by repairing it.
You will need:
2x M2 screws (6mm or 7mm long)
1x M2 nut
2x 4mm (OD) x 2mm (ID) metal washers (optional)