Okla. Stat. tit. 47, § 47-12-413: Seat belts or shoulder harnesses

It shall be unlawful for any person to sell or offer for sale at

retail or trade or transfer from or to Oklahoma residents any

passenger vehicle which is manufactured or assembled commencing with

the 1966 models, unless such vehicle is equipped with safety belts

or safety shoulder harness combinations which are installed for the

use of persons in the left front and right front seats thereof.