Fender 70's "F" Tuners. This style of machine heads were used on Fender guitars during the CBS '70s. These "'70s reissue" tuners are the 'VERSION II' style of the "F" tuner with precision geared innards. They require very careful counter boring on the back end of the headstock. No, these are not 'drop in' replacement tuners for the flimsy stamped tuners on your '74 Strat but they may fit your '79 with no modifications required. Chrome plated, includes press-in bushings and screws. Fender "F" stamped into back of chrome plated stamped metal tuner case. If you do want to install these on an early '70s guitar you will have to get the holes on the back side of the headstock counterbored approx. 1/4" deep. We recommend that installations requiring counterboring be done only by an expert luthier familiar with vintage Fender guitars. Diecast collar that extends into the back of the headstock measures .379" diameter, .249" height. Split shaft with 'safety string' hole in the center. Straight portion of tuner shaft .234". I measured .399" across the spline portion of the headstock bushings, .473" across the upper lip. Brand New. Genuine Fender 0990822100. UPC 717669511388. Expertly manufactured in Korea.