The bad news is that we do not have any replacements in stock.
We have some easy Due It Yourself suggestions.
1) Make up a silicone or rubber plug. The dimensions are Top Width of the Plug is 10.05mm and 6.00mm thick with a 3.9mm stem that is 2.5mm deep.
2) Search for the source of this plug on Alibaba.com. You will find multiple sources. Search the phrase "silicone rubber cover/cap for flashlight switch on/off buttons" for sources.
The phrase is somewhat long. Remember that the Chinese are trying to use as many words so that their products are recognized.
Ask for a sample of the product you find. This way your costs will be minimum and you can order from different vendors until you find the correct one.
JG Technical Support is part of Jungle Ghost Enterprises (JGE) in Wayne, NJ. JG created JGE in 2007 specifically as a Repair and Service Center Worldwide for Magellan Triton and the New Explorist X10 units.