Kluson KD-3P-NP 3 Per Plate Nickel Oval Plastic Button Tuner SetImportant Specs and Dimensions: total center to center distance of all 3 posts = 2 3 4 in. center to center distance between posts 1 3 8 in. length of baseplate 4 1 4 in., post height = 1 in. drilled post, single hole, post dia. 1 4 in. (. 25 in.)This is a complete set and comes with both left and ride side tuners. Also comes complete with bushings and mounting screws. Historically these tuning machines would have been used between the years 1965 and