Need 1/2" yellow peel and stick numbers and letters w/o background

Hi All,

I have Googled  and come up with nothing I can use.

I am looking for 1/2" tall yellow numbers and letters that are of the peel and stick variety without a colored background or with a clear background that allows the paint on the panel to show through.

I have found letters and numbers on a black background but since the control panel is green, I would prefer a number or letter that separates completely from the underlying base paper or plastic or has a clear background as stated above.

BTW, I asked the company from whom I purchased chart tape and they said they don't have letters or numbers.

Any suggestions for a source would be appreciated.

Thanks,

Ed