You have to rub the stickers so that the letters stick to the plastic part. When peeling off, don't just rip into it, remove the paper part SLOWLY and there won't be an issue.
I'v bought many car stickers and always find that some of the letter don't peel of first time.
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K&N, 35mm droper, axle spacers, de-tango,
LED's all round, Retro Fiesta badge, wind deflectors.