Help With Bumper Sticker Cline Industries Oklahoma

[cericd]

So, I have researched this for quite a while and I can't come up with an answer. My truck was originally purchased in Paris, TX near the TX OK border. The original rear bumper is white with two stickers saying "SAFETY BUMPER" and another sticker from the bumper's manufacturer Cline Industries. Part of the sticker has been worn off and I have been trying to find out the first word/s of the sticker. I'm hoping someone may be familiar with this bumper sticker. Maybe someone from Oklahoma.

It reads: "________OY BUMPER"

I originally thought COWBOY BUMPER but it didn't work out when I mocked it up in Photoshop. The word COWBOY is too short.