I bought a couple of T3 headlamp assemblies (to get the bulbs) this weekend, supposedly from a '69 Chevrolet. When I got home and cleaned them up and inspected them, I note that they have a 'code' on the top front which appears to be a 'date code'. I don't recall ever reading anything about the date codes, as there is a great deal of 'mis information' in general re the various T3 lamps. Can someone enlighten me on this subject? Are lamp bulb date codes 'judged' by the ACA?