Hi Jenny, according to this blog post, the 9" X 4" Pain de Mie pan will work well for recipes calling for either an 8 1/2" X 4 1/2" pan or a 9" X 5" pan. I'm not sure which recipe you made, but if you wanted to increase the size of the recipe to fit that pan a bit more fully, you could certainly increase the recipe by multiplying the weight of each ingredient by 1.25. 

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