Backbone Guitar Products Stratobone
STRATOBONE brings more sustain, punch, clarity, faster attack, more chime and resonance to your Strat-style guitar. Installation is easy, non-invasive and requires only a medium Phillips head screwdriver and a new set of strings.
Version A - The distance between the Tremolo Screw Holes is 1 1/4" - Typical of Mexican and import Strat style guitars