Just for the record, My 390GT/CS had a build date of 26D - April 26, the date of change from Marchal to Lucas - and the special order owner took possession of the vehicle on May 5, so the build date is very close. The car was an original unrestored, and came with Lucas lights, absolutely no markings on the brackets, they were virgin with no "scratches" or evidence of previously installed Marchals. So we know at least by April 26, the San Jose plant did have Lucas lights in stock for the changeover at this date.