You may not be aware, but there are two types of switch tips for Stratocasters. Import and USA switches come in two different dimensions. If you purchase a USA switch tip for an import switch, you'll be left with a loose tip. If you purchase an import switch tip for a USA switch, it won't fit.
The USA slot is suitable for Fender, Oak Grigsby and CRL switches.
USA slot - 5mm wide x 1mm