Quoted from moto_cat:Try Retro Refurbs, I don't have experience w/ them but I have heard positive results from other people.
http://www.retrorefurbs.com/shop/pirates-of-the-caribbean-pinball-cabinet-decals-original/
They seem to be the only place that has them from my search last year. I bought a set, but haven't installed it, if you've got any questions