I was glad I could find these from a hobby "shop" vs ordering from Radio Master. I have no idea as to how I lost one of these little nuts from my transmitter but wanted to secure the switch by replacing the missing nut. All of these nuts on my transmitter are blue, but I was unable to find this color anywhere.
A note to the folks at Buddy RC (if you are reading this), please let me know if you ever get any blue switch nuts.