Please consider including three (or four so there is a spare) appropriate diameter mounting screws with nut and washer. These are not easy to find. My nearby big box stores only go down to M3. The next two stops at local hardware stores didn’t have what I needed. Going to have to drive across town to another and hope the person on the phone was correct about their stock.
If you buy these in bulk, they will be less than $1 to add and most likely will not increase your shipping. I would pay $5 more just to not have to phone stores and drive around.