Is this for a hybrid? Is that why you're wanting 500 decals on your 250?

If so, DR Slapp on eBay makes OEM reproduction decals cheap, and he will customize them if you like. Years ago, I had him make me custom decals that are just like an '86 LT250R, but say 500 instead of 250. He saved the template. I think at least a few other people have bought them from him since then. They are not priced bad at all.