PS CS4 Extended: Default texture aspect ratio on standard shapes

Hi,

I want to design a cover for the default soft drink can 3D model. I create a 3D layer from a 2D standard layer. However I cannot find out the aspect ratio for the standard texture applied to the can's surface in order to be able to produce a cover without any distortions. Where can I find this information OR the default textures?

Thanks. I am desperate finding an answer... :(

The distortion information should come from whomever is in charge of printing the cans.