Those stickers are not made to be removed and trying will almost always destroy them. They are not required by law and (at least for domestics) and cannot be replaced. They are a one time only thing from the factory when the vehicle was built. Don't sweat it, the world won't end just because the labels are gone. Go down to your local GM parts dept. and have them give you a copy of the RPO codes. They have ALL the info of the vehicle build and put that in your glove box.
'08.5 Mazda 3
'90 Laser RS-T
'07 Yamaha R6