Oh that's a wonderful idea with the carbonless paper!! Kudos to ya!!
I was gonna say: cut your own stencil!
You probably already have a woodburner, get some stencil plastic, print out the letters in size needed, lay down, cover with glass, put on plastic and cut out with the woodburner tip.
Tadaaa.... your own stencil..... in any font ya want (just keep in mind that the middle WILL fall out of the O if ya cut it out LOL - leave in little "bridges" - you can always paint over them later) oh boy, guess how I know THAT!!
HTH a bit,