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You need to find a paint supplier who will mix the BINDER only. Very few paint supply shops know how to do this or want to do this for some reason. We use a Sherwin Williams near us as they know how to provide just the binder. You'll need the paint code for the Jeep color obviously. I'm sure you'll be able to find someone able to ship it to you in Japan.
If you get the correct binder, you'll get a really good color match.