I just got my build hardware kit for the C-beam and in it was a really nice sticker. However I don't put stickers on the outside of my car. I would put it on the inside of the back window though. Have you looked into the possibility of a two sided sticker that would make this possible. I know that that the AMA for RC aircraft does that. I would love to advertise Openbuilds that way. They last longer in side the car too.