For most Squier® Stratocaster® guitars with modern style tuning machines, the Guitar Tuner Upgrade Kit (6 Inline Headstocks) will be a direct fit.
In the case of most Squier® guitars equipped with vintage style tuning machines, the Vintage Guitar Tuner Upgrade Kit (6 Inline Headstocks) is a direct fit. Please note that some MIC Squier® guitars require the string post hole to be drilled out to 11/32" (8.5mm).