This is the air cleaner that is shipped in the trunk with the factory cowl plenum air cleaner. All 1967 Z-28's that were ordered with this option came with the unit shipped in the trunk to be dealer installed.

Bet you have never opened the trunk on a 67 Z28 to find an un-installed cowl plenum !! Not to mention a complete set of un-installed rally caps and rings. Jon Mello did when he opened the trunk of his very original Z-28.