Modern style Squier® Telecaster® tuning machines use a 10mm headstock hole. These machines often have one mount screw that is offset in one of several positions. Many times the tuning machines don't have mount screws at all. They all have a nut on the front that you need to unscrew with a 10mm hex wrench. For these style tuning machines, the Guitar Tuner Upgrade Kit (6 Inline Headstocks) will be a direct fit.
Many Squier® guitars come with vintage style tuning machines. These tuners are held in by 2 mount screws each. Many times two adjacent tuners share the same screw but in some cases, they each have their own set. They also have a press in bushing on the font that needs to be tapped out. 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).