[Dan Case]

By design the Ford supplied wiring harnesses (street cars) and alternators were introduced when the then new specification and contract came together at CSX2201. Ford introduced alternators on various vehicles as 1963 models. The option was quite rare. I have a voltage regulator removed from a early alternator fitted Cobra that has a date code from mid 1962 on it which fits the Ford 1963 model year start up.

The first Cobras of that design set were assembled during the late 1963 calendar year. To finish your answering your question, CSX2201 through CSX2589 finished between late 1963 and mid 1965 all got the same electrical system including Ford 1963 model year design alternator.