Okay, here's the very best solution of all:
Use some professional grade Decal Remover and a hard rubber spatula (so as not to scratch the paint) to only remove the "3" and the "dot" characters from each side fender, leaving the "5L" remaining in place (then it will be quickly finished to perfection without spending an additional $250). Having only the "5L" will be sufficient.
You're Welcome.