Internet links ain't always accurate. Had people tell me that side marker lights were stock starting in so and so year and presented a link but they were wrong......
All true, but I wrote the linked article and it's (over)loaded with massive amounts of supporting evidence, so…maybe…I donno…go look at it or something.
(sidemarker lights and/or reflectors from 1/1/68; sidemarker lights and reflectors from 1/1/70)