This reverse clicky switch fits and is used in a lot of lights out there and is often harder to find.  It fits the Convoy S6 and Small Sun ZY-T08, along with many other lights.

Dimensions:

• Width: 12mm x 8mm
• Height: ~8mm

Specifications:

• 1A, 30VDC (we often push these to 5A+ and they hold up well)
• 50,000 cycle life at rated current