I have created a document in LaTeX and the document is complete, but the printers have asked for a 3mm white board applied to the PDF, so the overall size is 6mm wider and taller than standard A4.  How would I do this?  I found a similar question but this is for A5 paper instead:   \documentclass[a4paper, twoside, 12pt, hidelinks, final]{article}  \usepackage[top=1in, bottom=1in, left=0.75in, right=0.75in, headheight=35.4pt, footskip=35.4pt]{geometry}  \begin{document}  \clearpage\mbox{}\clearpage  \end{document}```
I have seen the options such as a4paper, a5paper, letterpaper, etc... to go in the square brackets after \documentclass, but what I want is 8.25 inches width by 10.75 inches height for one document and 6 inches width by 9 inches height for another one. How is this done?
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