1967 Glove Box and Spare Tire Lock Key Blanks Pearhead Head B Groove Reproduction includes the key knockout. These are the secondary keys that would be used for glove box locks, spare tire lock.
These secondary keys work for spare tire locks and glove box and are the "finishing touch" for any 1967 Corvette restoration. Raised letters -GM-Your Key to Greater Value is on both sides of the keys.
When your Corvette left the factory, it was equipped with two of each primary and secondary keys.