Factory Effex 12-94414 Black 1' (Suzuki) Die-Cut Sticker

how to install. Meaning, should I use heat gun? Does clear tape comes off and letter stay on without it? Or, letters stay only with clear tape?

Does it come in pairs? Or single sticker?

Why wouldn’t it stick and peel from the letters

I clean surface with windex. Paper and everything stuck to the quad and let it sit ,letter would not come off clear plastic, letters did not peel off