[OS X TeX] print-on-demand

[Wendy McKay]

I have a book that has been typeset with letterpaper and a 
given style file with textheight and textwidth as follows:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\headheight=9pt
\headsep=15pt
\textheight=45pc   %=7.47in
\advance\textheight-2\p@
\textwidth=27pc    %=4.483in
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


In order to use a print-on-demand service I have to reprint the PDF file 
to a 7x10 page, but this reduces the font size.

Is there a way to typeset the document with the same style file so that 
the pdf ouput will be for 7x10 in paper and will not need resizing after 
the document is typeset.


\\wendy