Is there a b5paper japanese style in latex?

My thesis is written in b5j documentclass style.

\documentclass[b5j,twoside,12pt]{report}

I have a paper that is appended at the end. However this is written in b5paper style as an article.

\documentclass[12pt,b5paper,twoside]{article}

How do I get the paper to follow the 开发者_如何转开发japanese style? Havent found any b5paperj options in the geometry package.. :-/

---

It is possible to build the paper that must be appended separately and input it in your document using pdfpages. This way you don't have to control both styles and the package provides enough flexibility to make it look like you want to.