National Traffic and Motor Vehicle Safety Act, Passed Sep 9, 1966, is what created the seat belt requirement for manufacturers.
http://www.enotes.com/major-acts-con...cle-safety-act
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The National Traffic and Motor Vehicle Safety Act of 1966 required seat belts on all new American vehicles from the 1968 model year onward.
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http://www.takepart.com/news/2010/07...oint-seatbelt-
All regulations took effect by the 1968 model year. Many manufacturers began standard installation of seat belts in 1967 my if not before.