not sure what page layout app you'll be using  but, 48Hourprint.com has a bunch of  "Guideline Templates" available... (Photoshop, Illustrator, InDesign, QuarkXpress, CorelDraw, Publisher, Freehand)

take a look, maybe they'll have the correct template size you need.

http://www.48hourprint.com/photoshop-templates.html

retrocity