Jay,
The stickers you are looking for were sold by Ace R/C, now Ace Hobby Distributors
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However, believe the stickers were discontinued, along with a lot of other handy Ace products, when Ace R/C was aquired by the present owners.
Your best bet is to go with the other commercial offerings, as linked in this topic thread, or compose your own on a computer. If an ink jet or laser printer is used, and can be heat-laminated, the resulting labels are very durable. Fading can be minimized by facing the frequency board away from the sun, or building a cover over the board to shade it and protect it from the weather. Also, avoid the color red, which seems to fade quickly.
D. Anderson Montana