Can’t answer your specific flasher unit question, other than to say when I was researching them for my Camaro, I found it a subject with very little factual info available.
The Factory AIM listed several different part numbers as ‘optional’ for both turn signal and 4-way flasher units. There was no clear cross-reference material between GM part number and manufacturer flasher ID number, so I began looking at what was on unrestored cars - but conceding flashers were frequently replaced over time.
I found original cars with both Tung-Sol and Signal-Stat flashers, both round and rectangular, and with plastic and metal cans. At some point after the ‘69 model year, but not sure which year, ‘DoT’ started to appear on flashers, and most have a 3-digit date code (although the Decoding format is debatable).
Figured if you base your decision on what to use after looking at as many unrestored cars of the same type as you can find, and it functions correctly, who can tell you it’s incorrect?
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Tim in NSW, Australia
1969 Van Nuys 04A Z/28 from Clippinger Chevrolet.
Cortez Silver with dark blue interior.
Ran at Lions Dragstrip and Pomona Raceway, with paint by Bob Kovacs of Fresno.
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