Each of our lights come with one mount each, depending on the application they're designed for, and they don't fit every single bike/helmet/etc everywhere. There are two main reasons we don't include a ton of different mounts with every light:
Cost - every individual thing we put in the box increases the cost, which means we'd have to raise the price of every light, when the overwhelming majority of users only need and only use 1 mount.
Waste - if we included 10 different mounts for different shape helmets and handlebars and only 1 gets used, that means 9 pieces of plastic and metal get relegated to a dusty bin in the garage, or worse: the garbage.
Bottom line: we don't want customers to pay more for us to produce more waste in this world. So if you need a different mount, or multiples, we have them available.