Staying with the topic of this thread, "Cast 67 door hinges", the 1960-68 MPC shows that the change from cast (note that the MPC mistakenly notes "die cast") to stamped steel supposedly occurred on October 3, 1966 (copy of appropriate page attached), which is similar to TLea's belief in an earlier Post. However, as John (67gta289) noted, his December 20, 1966 car has cast hinges. And going further, my January 31, 1967 Dearborn built 67 Convertible also has the cast hinges (pictures attached).
One must then surmise that both San Jose and Dearborn had larger than normal of the "storage areas" that Jeff mentioned ??
One final note of interest is that at sometime after the 1967 Model year, another change occurred to the hinges, as Part Number C7ZZ-6522800/01-B are shown in the 1968 OSI book as being "Replaced By" Part Number C7ZZ-6522800/01-C. This "-C" Part Number is of course what appears in the 1965-72 MPC, which was printed in 1975.
Bob