1. Order three year's worth of these at a time. Find a place to store them, then realize a few month's in that they aren't really the right size for what you need.
2. Track inventory meticulously. Do a physical count daily, or require employees to scan them in and out so you can view the count from your computer at any moment.
3. Create a reasonable warning system so you know before you run out with enough time to avoid disrupting regular operations.
Here's one way to implement #3: print out a bunch of labels like the ones in the photo. We print the words "Don't Use Without Reordering - No Usar Sin Reordenar" on the label. The item to be reordered can be written down as well, so you can remove the label when you get to it and use that as your reminder to order the items.