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They have material in hobby shops to MAKE your own decals too. I thought about replacing the blue Kosei with red to match my car, but just removed them and was happy with that.
Look up "Marchesini decals" on eBay (Since Marchesini wheels are popular, there are always several vinyl/graphics companies selling them at any given time), and shoot one of the sellers an e-mail asking if they'll do up some Kosei decals for you. Most of their auction descriptions say that they're happy to do custom work.